Neutron radiation field simulation method, neutron radiation monitoring simulation training system and application

Abstract

The invention relates to a neutron radiation field simulation method, a neutron radiation monitoring simulation training system and application of the neutron radiation field simulation method and the neutron radiation monitoring simulation training system, and is characterized in that a three-dimensional simulation neutron radiation field and the neutron radiation monitoring simulation training system are constructed based on the Beidou positioning technology, the computer and communication technology and the action law of neutron rays and substances. The simulation training system is composed of a guide center, a positioning and communication base station, a simulation training ground, a simulation neutron radioactive source and a simulation neutron radiation monitor. The parts of the system keep communication and exchange information. The simulated neutron radiation source and the simulated neutron radiation monitor have an accurate positioning function, and the simulated neutron radiation monitor also has a function of calculating and obtaining a neutron radiation dose equivalent rate and a dose equivalent. According to the invention, simulation of multi-neutron source and three-dimensional distribution of a real neutron radiation field is effectively realized, so that simulation training effects of searching for neutron radiation sources, determining neutron radioactive contamination boundaries, monitoring neutron dose equivalent and the like are close to reality.

Description

Technical Field

[0001] The present invention belongs to the technical field of nuclear radiation monitoring, and in particular relates to a neutron radiation field simulation method, a neutron radiation monitoring simulation training system constructed based on the simulation method, and practical application of the simulation training system. Background Art

[0002] With the continuous development and widespread application of nuclear science and technology, the popularization of nuclear safety knowledge and the prevention and disposal of nuclear accidents have attracted great attention from the country.

[0003] After a nuclear accident occurs, the nuclear radiation environment formed is complex and diverse, including gamma radiation, neutron radiation, and surface alpha and beta radiation. Timely monitoring of nuclear radiation intensity, defining the scope of radioactive contamination, and assessing the nature and level of radioactive contamination are the basic functions of the professional team for nuclear accident prevention and disposal.

[0004] Improving the knowledge level and professional skills of personnel in professional institutions for nuclear accident prevention and disposal, developing professional equipment, and strengthening the nuclear protection of professional team personnel have become the top priorities facing national emergency management departments and professional teams.

[0005] Due to the hidden nature of nuclear radiation's harm to the human body and the country's strict control over radioactive sources, there are the following problems if real radioactive sources are used for nuclear radiation monitoring training. First, the radiation emitted by real radioactive sources will cause radiation damage to trainees, causing great fear and seriously affecting the training effect. Second, the country strictly controls the purchase and sale of radioactive sources, and the procedures for obtaining radioactive sources are cumbersome and difficult. Third, once a radioactive source is lost, it will cause harm to the public. If it is controlled and used by terrorists, it will cause nuclear terrorist accidents. For this reason, the state has extremely strict requirements for the management of radioactive sources, and the legal responsibility for the safe custody of radioactive sources is heavy.

[0006] Therefore, it is necessary to build a simulation training system for nuclear radiation monitoring, explore a set of methods to train and assess the professional skills of professional teams and their ability to deal with nuclear accidents on site without using real radiation sources, and design and equip the simulated radiation sources and simulated monitors required for simulation training. Summary of the invention

[0007] The purpose of the present invention is to propose a neutron radiation field simulation method, construct a neutron radiation monitoring simulation training system and its practical application, and train professional team members in neutron nuclear radiation monitoring skills without using a real neutron radiation source.

[0008] To achieve the above object, the technical solution of the neutron radiation field simulation method proposed in the present invention is: using Beidou RTK positioning technology and computer technology, a three-dimensional simulated neutron radiation field composed of a plurality of regular cubes is constructed on a training ground, in which each regular cube center point has a certain longitude, latitude and elevation, and the spatial position (longitude, latitude and elevation) of the center point of any cube A in the three-dimensional space is connected with the spatial position (longitude, latitude and elevation) of the center point of any cube B in the three-dimensional space. If the center point of cube A and the center point of cube B are at the same elevation, the plane distance X between the two center points can be calculated by substituting them into formula (1).

[0009]

[0010] Where:

[0011] X—the plane distance from the center point of cube A to the center point of cube B (m);

[0012] r—the average radius of the Earth, equal to 6.371×10 6 rice;

[0013] Φ1—the latitude of the center point of cube A;

[0014] Φ2—the latitude of the center point of cube B;

[0015] λ1—the longitude of the center point of cube A;

[0016] λ2—the longitude of the center point of cube B;

[0017] If the center point of cube A and the center point of cube B are not at the same elevation, substitute into formula (2) to calculate the spatial distance X between the two center points.

[0018]

[0019] Where:

[0020] X - the straight-line distance from the center of cube A to the center of cube B (m);

[0021] X' - the distance (meters) between the orthographic projection point at the same elevation of the center point of cube A and the center point of cube B;

[0022] h – height difference between the center point of cube A and the center point of cube B (m);

[0023] Assume that the simulated neutron radiation source is an isotropic monoenergetic neutron point source in the air, and divide the energy of the monoenergetic neutron point source from 0-20 MeV into 100 logarithmic evenly, that is, perform 100 monoenergetic isotropic neutron point source Monte Carlo calculations, and use the Monte Carlo particle transport method to calculate the distance from the neutron source X0-X m The neutron dose equivalent rate at m points within a meter (each point is 1 meter apart), that is, each point in space can obtain the dose equivalent rate results corresponding to 100 energies. Finally, the 100 energy-dose equivalent rate data at each point are spline interpolated in turn to obtain a fitting quadratic or high-order polynomial And obtain m neutron dose equivalent rate calculation formulas, and store the calculation formulas in the memory for neutron dose equivalent rate calculation in neutron radiation monitoring simulation training; after the distance, neutron energy and emission rate are given, the neutron dose equivalent rate is calculated as shown in formula (III);

[0024]

[0025] Where:

[0026] - the neutron dose equivalent rate produced by a neutron source with energy E and emission rate υ at a distance of X meters;

[0027] υ - emission rate (neutron yield) of neutron source;

[0028] - the dose equivalent rate produced by a single neutron of energy E at a distance of X meters;

[0029] When the simulated neutron source is located at the center point of the three-dimensional simulated neutron radiation field cube B, the distance between the center point of the three-dimensional simulated neutron radiation field cube A and the center point of the simulated neutron source cube B is X. i (i=0,1,2,...m) meters, then call the Xth memory from the memory i The dose equivalent rate generated by the simulated neutron source B at point A can be calculated by using the formula for calculating the neutron dose equivalent rate. If n simulated neutron radiation sources with energy E and emissivity υ are placed at different cube center points in three-dimensional space, and are substituted into formula (I) and formula (II) respectively, the distance X between the center point of the n simulated neutron radiation sources and the center point of any cube P in the three-dimensional space (assuming that the simulated neutron monitor is at the center point of the cube P) can be calculated. i , and then substitute them into formula (III) to obtain the simulated neutron dose equivalent rate formed by each simulated neutron radiation source point source at the center of the cube P Then add up the sum to get the total neutron dose equivalent rate of n simulated neutron radiation source points at the center of the cube P.

[0030] In the above-mentioned neutron radiation field simulation method and technical solution, the three-dimensional simulated neutron radiation field is based on precise spatial positioning technology (Beidou RTK), wireless communication technology and computer technology. On a training ground several meters long and several meters wide, a three-dimensional simulated neutron radiation field consisting of a cube with a side length of 1 decimeter is constructed. The center point of each cube corresponds to each spatial position (longitude, latitude and elevation) positioned by Beidou RTK. The simulated neutron radiation source and the simulated neutron monitor located in the three-dimensional simulated neutron radiation field determine their spatial position through Beidou RTK positioning technology. When a spatial position (longitude, latitude and elevation) of a simulated neutron radiation source falls into the three-dimensional simulated neutron radiation field, the simulated neutron radiation source and the simulated neutron monitor are located in the three-dimensional simulated neutron radiation field. The center point (longitude, latitude and elevation) of the cube is regarded as the location of the simulated neutron radiation source. Similarly, when a spatial point (longitude, latitude and elevation) of a simulated neutron monitor falls into a cube of the three-dimensional simulated neutron radiation field, the center point (longitude, latitude and elevation) of the cube is regarded as the location of the simulated neutron monitor. Substitute the position information of the center point of cube A where the simulated neutron monitor is located and the center point of cube B where the simulated neutron radiation source is located into formula (I) and formula (II) to calculate the spatial distance X between the simulated neutron radiation source and the simulated neutron monitor, and then substitute it into formula (III) to calculate the neutron dose equivalent rate of the location of the simulated neutron monitor. When n simulated neutron radiation sources are arranged in the three-dimensional simulated neutron radiation field, the dose equivalent rate value generated by each simulated neutron source is obtained by substituting them into the formula one by one. Then, the dose equivalent rates generated by n simulated neutron radiation sources at the point where the simulated neutron monitor is located are accumulated and summed to obtain the total neutron dose equivalent rate at the point where the simulated neutron monitor is located.

[0031] To achieve the above-mentioned purpose, the present invention provides a neutron radiation monitoring simulation training system, which comprises a neutron radiation monitoring simulation training guidance center (hereinafter referred to as the guidance center), a positioning and communication base station, a neutron radiation simulation training field (hereinafter referred to as the simulation training field), a simulated neutron radiation source and a simulated neutron monitor, and is characterized in that:

[0032] The guidance and control center includes a computer, several software modules and functional modules; the software modules include a simulated neutron radiation source and a simulated neutron monitor working status detection and control module, a simulated neutron radiation source setting module, a simulated neutron nuclear radiation field calculation and evaluation module, a simulated training subject setting module, a trainee training assessment module, and a trainee and simulation equipment information management module; the functional modules include a face recognition module and a QR code recognition module;

[0033] The positioning and communication base station includes a Beidou RTK positioning reference station, a mobile wireless communication base station, and an optical fiber switch. The Beidou RTK positioning reference station and the mobile wireless communication base station are respectively connected to the optical fiber switch by optical signals or electrical signals;

[0034] The simulation training ground is a ground and space area with specific topography and a certain area that can meet the requirements of neutron radiation monitoring simulation training;

[0035] The number of the simulated neutron radiation sources is either one or any number; the simulated neutron radiation source is composed of a mobile communication module, a Beidou RTK positioning module, a single-chip microcomputer, an acceleration sensor, a display module, an initial parameter storage module, a parameter selection manual button and a power supply, and the mobile communication module, the Beidou RTK positioning module, the display module, the initial parameter storage module, and the parameter selection manual button are all electrically connected to the single-chip microcomputer, and the power supply provides electrical energy for each of the above components and the single-chip microcomputer;

[0036] The simulated neutron monitor is composed of a mobile communication module, a Beidou RTK positioning module, a single-chip microcomputer, a software module, an acceleration sensor, an alarm and display, an operation panel and a power supply. The mobile communication module, the Beidou RTK positioning module, the acceleration sensor, the alarm and display, and the operation panel are all electrically connected to the single-chip microcomputer. The software module is pre-input into the single-chip microcomputer. The power supply provides electrical energy for the above-mentioned components and the single-chip microcomputer. The appearance, shape, weight, alarm mode, response time and operation panel of the simulated neutron monitor are the same as those of the neutron monitor actually used.

[0037] The computer of the above-mentioned command and control center is connected to the optical fiber switch in the positioning and communication base station through an Ethernet cable or optical fiber in the form of electrical or optical signals. The Beidou RTK positioning module in the above-mentioned simulated neutron radiation source and simulated neutron monitor obtains positioning reference information from the Beidou RTK positioning reference station. The wireless communication module in the above-mentioned simulated neutron radiation source and simulated neutron monitor maintains communication with the mobile wireless communication base station.

[0038] In the above-mentioned neutron radiation monitoring simulation training system, the simulated neutron radiation source initial parameter storage module stores the simulated neutron radiation source name, energy E and emissivity υ preset by the computer of the guidance and control center; the name, energy E and emissivity υ of the simulated neutron radiation source can be assigned wirelessly by the guidance and control center or manually through the parameter selection manual button.

[0039] In the above neutron radiation monitoring simulation training system, the software modules in the simulated neutron monitor include a distance calculation module between the simulated neutron radiation source and the simulated neutron monitor, a neutron dose equivalent rate calculation module and a neutron cumulative dose calculation module.

[0040] In the above-mentioned neutron radiation monitoring simulation training system, the memory in the neutron dose equivalent rate calculation module of the simulated neutron monitor pre-stores a set of neutron dose equivalent rate calculation formulas obtained by Monte Carlo model calculation. When the simulated neutron monitor obtains the name of the simulated neutron radiation source, the emission rate v, and the energy E, the corresponding neutron dose equivalent rate calculation formula is retrieved from the memory according to the distance X value between the simulated neutron radiation source and the simulated neutron monitor, and the neutron dose equivalent rate is obtained by substituting the emission rate v and the energy E.

[0041] To achieve the above purpose, the present invention also provides an application of a neutron radiation monitoring simulation training system.

[0042] First, build a neutron nuclear radiation monitoring simulation training system:

[0043] The system comprises a guidance and control center, a positioning and communication base station, a simulation training ground, a simulation neutron radiation source and a simulation neutron monitor. The guidance and control center comprises a computer, a plurality of software modules and a functional module; the positioning and communication base station comprises a Beidou RTK positioning base station, a mobile wireless communication base station and an optical fiber switch, and the Beidou RTK positioning base station and the mobile wireless communication base station are respectively connected to the optical fiber switch by optical or electrical signals; the simulation training ground can meet the requirements of nuclear radiation monitoring simulation training and has a specific topography and a determined area; the simulation neutron radiation source comprises a mobile communication module, a Beidou RTK positioning module, a single-chip microcomputer, an acceleration sensor, a display module, an initial parameter storage module and a power supply, and the mobile wireless communication module, the Beidou RTK positioning module, the display module and the initial parameter storage module are all electrically connected to the single-chip microcomputer, and the power supply provides electrical energy for the above-mentioned components and the single-chip microcomputer; the simulation neutron monitor It is composed of a mobile wireless communication module, a Beidou RTK positioning module, a single-chip computer, a software module, an acceleration sensor, an alarm and display, an operation panel and a power supply. The mobile wireless communication module, the Beidou RTK positioning module, the acceleration sensor, the alarm and display, and the operation panel are all electrically connected to the single-chip computer. The software module is pre-input into the single-chip computer. The power supply provides electrical energy for the above components and the single-chip computer. The appearance, shape, weight, alarm mode, response time and operation panel of the simulated neutron monitor are the same as those of the neutron monitor actually used. The computer of the above-mentioned simulation training and guidance center is connected to the optical fiber switch in the positioning and communication base station through an Ethernet cable or an optical fiber in the form of an electrical or optical signal. The Beidou RTK positioning module in the above-mentioned simulated neutron radiation source and the simulated neutron monitor obtains positioning reference information from the Beidou RTK positioning reference station. The above-mentioned simulated neutron radiation source and the wireless communication module in the simulated neutron monitor maintain communication with the mobile wireless communication base station.

[0044] Second, build an outdoor neutron radiation monitoring simulation training field:

[0045] Select an outdoor venue with specific terrain and area as a simulation training field, set up a Beidou RTK positioning base station and a mobile wireless communication base station, and after the computer of the command and control center is powered on, the Beidou RTK positioning base station will transmit the Beidou positioning reference information to the mobile wireless communication base station through the optical fiber switch, and the wireless communication base station will broadcast the Beidou positioning reference information;

[0046] Third, simulate the layout of neutron radiation sources and their parameter settings:

[0047] Each simulated neutron radiation source has a unique identity code (ID). When the simulated neutron radiation source is turned on and powered on, it is in a simulated radioactive working state.

[0048] One of the ways to arrange and set parameters of simulated neutron radiation sources: When the personnel of the guidance and dispatching center arrange several simulated neutron radiation sources at different points in the simulated training field according to the requirements of the simulated training and turn them on, they will then preset the name, emissivity and energy of the simulated neutron radiation sources through the manual button of the parameter selection of each simulated neutron radiation source. After the simulated neutron radiation source is turned on for self-test, the simulated neutron radiation sources at each point will perform joint calculation by receiving the positioning reference information of Beidou RTK and combining it with the Beidou information obtained by itself, and then send their respective ID codes, Beidou precise positioning information and preset parameter information through the wireless communication module;

[0049] The second method of simulating neutron radiation source layout and parameter setting:

[0050] Several simulated neutron radiation sources are arranged at various points in the outdoor simulation training field according to the simulation training requirements. After the simulated neutron radiation sources are powered on for self-test, the simulated neutron radiation sources at each point receive the positioning reference information of Beidou RTK and combine it with the Beidou information obtained by itself to perform joint calculation to obtain their own centimeter-level precise positioning information, and send their own ID codes and precise positioning information (longitude, latitude and altitude) to the guidance and control center. After the guidance and control center receives the ID codes and precise positioning information of the simulated neutron radiation sources at each point, it immediately sets the parameters of each simulated neutron radiation source (neutron radiation source name, energy E, emissivity ν) in the guidance and control center computer, and sends the set parameters to each simulated neutron radiation source, and stores them in the initial parameter storage module. Each simulated neutron radiation source then sends its own ID code, Beidou precise positioning and parameter information through the mobile wireless communication base station;

[0051] In order to intuitively display the simulated training field and the simulated training effect, a simulated three-dimensional neutron radiation field is constructed on the computer of the guidance and control center and displayed on the computer screen, and the simulated three-dimensional neutron radiation field is divided into a number of 1 decimeter × 1 decimeter × 1 decimeter cubes. When the simulated neutron radiation source is arranged in the simulated training field, the computer of the guidance and control center calculates the total simulated neutron dose equivalent rate data of each cube center point of the simulated three-dimensional neutron radiation field according to the location of the simulated neutron radiation source and the preset parameters using formula (I), formula (II) and formula (III), and stores the data in the electronic spreadsheet of the computer of the guidance and control center. When the location of the simulated neutron monitor is within a certain cube range, the computer of the guidance and control center sends the total simulated neutron dose equivalent rate data of the cube center point to the simulated neutron monitor through wireless communication;

[0052] Fourth, the simulated neutron monitor enters the simulated training field for practical training. Each simulated neutron monitor has a unique identity code (ID). When the simulated neutron monitor is turned on and powered on, the simulated neutron monitor is in the simulated detection working state:

[0053] (1) Finding simulated neutron radiation sources:

[0054] After a simulated neutron monitor at a certain spatial position in the simulated training ground is turned on, on the one hand, it receives the positioning reference information sent by the Beidou RTK base station, and performs joint calculation with its own Beidou positioning information to obtain the precise position information (longitude, latitude and elevation) of the point where the simulated neutron monitor is located, and uploads the precise position information of the point to the guidance and control center. On the other hand, it receives the parameters of each simulated neutron radiation source (simulated neutron source name, energy, emissivity) and the precise position information of the point where it is located broadcast by the guidance and control center, and substitutes them into formula (1) and formula (2) to calculate the spatial distance X between the simulated neutron monitor and each simulated neutron radiation source. The single-chip microcomputer in the simulated neutron monitor then calls out formula (3) corresponding to the distance X from the memory, and then substitutes the parameters related to the simulated neutron radiation source into the calculation to obtain the neutron dose equivalent rate generated by the simulated neutron radiation source at this specific distance X. Finally, the total neutron dose equivalent rate at the precise position of the simulated neutron monitor is obtained by accumulating and summing. The acceleration sensor in the simulated neutron monitor can sense the movement and stop status of the simulated neutron monitor. Each time it stops, a new position information is calculated and provided. When the simulated neutron monitor moves to a new point, the simulated neutron monitor will jointly solve the Beidou positioning information of the new point with the received Beidou RTK positioning reference information to obtain the precise positioning information of the new point, and then repeat the above calculation process to obtain the total neutron dose equivalent rate of the new point.

[0055] When the simulated neutron monitor follows the total neutron dose equivalent rate The simulated neutron monitor moves in the direction of increasing values, which means that the simulated neutron monitor is gradually approaching a certain simulated neutron radiation source. When a certain simulated neutron radiation source is found, the precise position of the simulated neutron radiation source found is reported to the guidance center by operating the power switch of the simulated neutron monitor (pressing the power switch twice in quick succession). Subsequently, the power of the simulated neutron radiation source is either turned off or all information of the simulated neutron radiation source found is automatically shielded. When the monitor continues to move in the direction and route of the gradually increasing total neutron dose equivalent rate value displayed on the simulated neutron monitor, the next simulated neutron radiation source can be found until all simulated neutron radiation sources are found.

[0056] (2) Determine the neutron radiation contamination area:

[0057] In the above scenario (1) of searching for a simulated neutron radiation source, when the total neutron dose equivalent rate value observed by the trainee on the simulated neutron monitor reaches the safety critical value set for the simulated training subject, the trainee sends the ID, neutron dose equivalent rate and precise location information data packet of the simulated neutron monitor at that moment to the guidance center through the simulated neutron monitor (by pressing the power switch twice in quick succession) and makes a physical mark at that location (such as inserting a small red flag or placing a tumbler device with positioning and sound and light alarm functions);

[0058] When the simulated neutron monitor moves along the same direction and route as the total neutron radiation dose equivalent rate value (safety critical value), and transmits the precise position information of each point reaching the total neutron radiation dose equivalent rate value (safety critical value) to the control center, on the computer screen of the control center, if these points with the same total neutron radiation dose equivalent rate value (safety critical value) are connected into a line, the boundary line of the simulated neutron radioactive contamination area measured on site by the trainees can be obtained; if the physical marks made by the trainees on the simulated training field are connected, the scope of the simulated neutron radioactive contamination area can be marked on site;

[0059] In the process of determining the neutron radiation contamination area, the simulated neutron monitor can be carried by the trainees into the simulated training field to complete the entire simulated training process; the simulated neutron monitor can also be carried on a drone, which hovers and measures point by point at a certain height in the simulated training field, and then flies along the specified direction and route to complete the entire simulated training process; the simulated neutron monitor can also be carried on a ground robot, so that the simulated neutron monitor is 1 meter above the ground, measures point by point, and then moves along the specified direction and route to complete the entire simulated training process;

[0060] (3) Real-time monitoring of personal neutron dose equivalent:

[0061] In the same scenario as (1) of finding a simulated neutron radiation source, a simulated neutron monitor is used to realize real-time measurement of personal cumulative dose equivalent. That is, the time spent from the start-up of the instrument or the completion of the previous total neutron dose equivalent rate measurement of the simulated neutron monitor to the completion of the current total neutron radiation dose equivalent rate measurement is multiplied by the current total neutron dose equivalent rate to obtain the personal neutron radiation dose equivalent received by the trainee in this neutron radiation measurement. The personal neutron radiation dose equivalent received by the trainee in each neutron radiation measurement during the entire training process is added together to obtain the personal cumulative dose equivalent received by the trainee during this simulated training. When the personal cumulative dose equivalent reaches the threshold value that is harmful to the human body, the simulated neutron monitor can alarm. During the simulated training process, the simulated neutron monitor can also display the personal cumulative dose equivalent value in real time.

[0062] Advantages of the present invention:

[0063] 1. The present invention is based on Beidou RTK positioning technology, computer technology, and mobile wireless communication technology, and regards the neutron radiation source as an isotropic monoenergetic neutron point source. The simulated neutron radiation field constructed thereby solves the simulation of the distribution of multiple neutron radiation sources in three-dimensional space in the real neutron radiation field. Based on the simulated neutron radiation field provided by the present invention, the neutron radiation monitoring simulation training system can be simplified, low-cost, and highly simulated, and can achieve the same training effect as using a real neutron radiation source.

[0064] 2. The positioning accuracy provided by the Beidou RTK positioning technology of the present invention is at the centimeter level, which is two to three orders of magnitude higher than the accuracy of directly using Beidou positioning information. It solves the crucial problem of accurate positioning for simulating nuclear radiation monitoring, such as finding neutron radiation sources, determining neutron radioactive contamination boundaries, and measuring personal neutron cumulative doses, making simulation training simple, effective, and realistic.

[0065] 3. The present invention completes the top-level design of the neutron radiation monitoring simulation training system. In addition to emitting the same communication signal as a mobile phone, the simulated neutron radiation source does not have any traditional neutron radiation source simulation materials such as magnetic lines and electromagnetic waves. Its yield decay and the law of interaction with matter are exactly the same as those of a real neutron radiation source, but it does not cause any harm to humans, meets green environmental protection requirements, and opens up a new path for simulation training of neutron radiation monitoring under nuclear accident conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0066] Figure 1 It is a schematic diagram of the composition of the neutron nuclear radiation monitoring simulation training system of the present invention.

[0067] Figure 2 It is a schematic diagram of the composition of the simulated neutron radiation source of the present invention.

[0068] Figure 3It is a schematic diagram of the structure of the simulated neutron monitor of the present invention.

[0069] Figure 4 This is a schematic diagram of a simulated neutron monitor and several simulated neutron radiation sources in a simulated training field in the first embodiment of the present invention.

[0070] Figure 5 It is a schematic diagram of the spatial distance between the calculated simulated neutron monitor and the simulated neutron radiation source of the present invention.

[0071] Figure 6 This is a schematic diagram comparing the measured results of the simulation training of the neutron radioactive contaminated area in the simulated nuclear radiation field with the theoretical calculation results in the second embodiment of the present invention.

[0072] Figure 7 This is a schematic diagram of the fifth embodiment of the present invention, which is a simulated neutron monitor carried by an unmanned aerial vehicle for measuring the neutron radiation dose equivalent rate in the air.

[0073] In the above figures, 1 is a nuclear radiation simulation training guidance center, 2 is a positioning and wireless communication base station, 3 is a nuclear radiation monitoring simulation training field, 4 is a simulated neutron radiation source, 5 is a simulated neutron monitor, 11 is a simulated equipment status detection and control module, 12 is a simulated radiation source setting module, 13 is a simulated nuclear radiation field calculation and evaluation module, 14 is a simulated training subject setting module, 15 is a training assessment module for trainees, 16 is a personnel and equipment information management module, 17 is a face and QR code recognition module, 18 is a computer, and 21 is a mobile wireless communication module. 1 is a base station, 22 is a fiber optic switch, 23 is a Beidou RTK positioning base station, 41 is a Beidou RTK positioning module, 42 is a display module, 43 is a parameter selection manual button, 44 is a mobile wireless communication module, 45 is a single-chip microcomputer, 46 is a neutron source parameter storage module, 47 is an acceleration sensor, 48 is a power supply, 51 is a Beidou RTK positioning module, 52 is an alarm and display module, 53 is an operation panel, 54 is a single-chip microcomputer, 55 is a mobile wireless communication module, 56 is an acceleration sensor, 57 is a power supply module, and 58 is a software module. DETAILED DESCRIPTION

[0074] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0075] First, we need to build a neutron radiation monitoring simulation training system. Figure 1 As shown, the system consists of a nuclear radiation monitoring simulation training guidance center (hereinafter referred to as the guidance center), a positioning and communication base station, a neutron radiation simulation training ground (hereinafter referred to as the simulation training ground), a simulated neutron radiation source and a simulated neutron monitor.

[0076] 1. The guidance and dispatching center is composed of a computer 18 and software modules. The computer is used for data collection, processing, storage and display. The software module is a computing technology support module, and the functions of each software module are as follows:

[0077] (1) The simulation instrument status detection and control software module 11 monitors the working status of all simulation instruments, including the simulation neutron monitor, simulation neutron radiation source, etc. When a simulation instrument fails, it gives a fault alarm message and controls the power on and off of the simulation neutron monitor and simulation neutron radiation source.

[0078] (2) The simulated radiation source setting software module 12 has the function of setting the name, energy and emissivity parameters of the simulated neutron radiation source.

[0079] (3) a simulation training field calculation and evaluation software module 13, which has the function of establishing a simulated neutron radiation field using a Monte Carlo mathematical model according to the name, energy, and emission rate of the neutron radiation source;

[0080] (4) The simulation training subject setting software module 14 has the function of setting various training subjects according to needs, such as the search for simulated neutron radiation sources, the measurement of the contamination boundary of simulated neutron radiation sources, the measurement of personal neutron cumulative dose, etc.

[0081] (5) The training assessment software module 15 for trainees has the function of assessing and evaluating the effectiveness of the simulated neutron nuclear radiation monitoring training for trainees, including the assessment of the ability of individuals, teams, drones or robots to find simulated neutron radiation sources and determine the boundaries of simulated neutron radiation contamination.

[0082] (6) Personnel and equipment information management module 16 has the function of managing the trainees and the simulated neutron radiation source and simulated neutron monitor, such as the maintenance and use records of the simulated neutron radiation source and simulated neutron monitor, technical indicators and training performance records of the trainees, etc.

[0083] (7) Face and QR code recognition management module 17 has the functions of face recognition and QR code recognition management. During training, it is necessary to bind the simulated neutron monitor to the trainee for easy management. For example, when the simulated neutron monitor is used, after recognizing the trainee's face, the QR code of the simulated neutron monitor held by the trainee is swiped, and the system binds the person to the simulated neutron monitor. The neutron radiation dose equivalent recorded by the instrument is recorded in the trainee's file until it is actively cancelled.

[0084] 2. The positioning and communication base station includes a Beidou RTK positioning base station 23, a mobile communication base station 21, and a fiber optic switch 22. The fiber optic switch is a network transmission relay device.

[0085] (1) Beidou RTK positioning base station includes Beidou positioning module and Beidou RTK module. RTK (Real-time kinematic) carrier phase differential technology is a differential method for real-time processing of carrier phase observations of two measurement stations. Beidou RTK base station must be a fixed station. It measures and calculates multiple satellite signals over a long period of time and a large number of times to minimize the errors caused by various factors in order to obtain its own accurate positioning. Beidou RTK positioning base station is used to provide positioning reference for simulated neutron radiation source and simulated neutron monitor. During simulation training, when the Beidou RTK positioning base station and the simulated neutron radiation source or simulated neutron monitor simultaneously receive information sent by the same satellite, the Beidou RTK positioning base station can quickly solve the positioning error caused by these satellite information, and then broadcast the positioning error through the wireless communication base station. After the simulated neutron radiation source or simulated neutron monitor receives the positioning error sent by the Beidou RTK positioning base station, it transmits the Beidou positioning information and positioning error obtained by itself to its own RTK module for solution, thereby obtaining the precise positioning value of the simulated neutron radiation source or simulated neutron monitor, with a positioning accuracy of centimeters.

[0086] (2) Communication and positioning base stations include mobile communication base stations, which usually use mobile communication base stations based on 4G / 5G standards. Simulation training grounds in developed areas can use mobile 4G / 5G public network communication base stations, and accordingly, mobile public network communication modules must also be used in simulated neutron monitors or simulated neutron radiation sources; in nuclear radiation monitoring simulation training in remote areas such as deserts and Gobi, where mobile wireless public network signals cannot reach, mobile private network communication base stations can be used, and accordingly, mobile private network communication modules must also be used in simulated neutron radiation sources or simulated neutron monitors.

[0087] 3. Simulate neutron radiation source 4, as attached Figure 2 shown.

[0088] The simulated neutron radiation source is composed of a Beidou RTK positioning module 41, a display module 42, a parameter selection manual button 43, a 4G / 5G public network (private network) communication module 44, a single-chip microcomputer 45, a parameter storage module 46, an acceleration sensor 47 and a power supply 48. Each simulated neutron radiation source has a unique identity code (ID). The initial parameters of the simulated neutron radiation source, such as the radiation source name, energy, and emissivity, can be set remotely and wirelessly by a computer or manually through the parameter selection manual button 43. After the simulated neutron radiation source name, energy, and emissivity are assigned, the simulated neutron radiation source obeys the exponential decay law, which is the same as the intensity decay law of the real neutron radiation source.

[0089] 4. Simulated neutron monitor 5, as attached Figure 3 shown.

[0090] The simulated neutron monitor is composed of a Beidou RTK positioning module 51, an alarm and display 52, an operation panel 53, a single-chip computer 54, a 4G / 5G public network (private network) communication module 55, an acceleration sensor 56, a power supply 57 and a software module 58. The software module 58 includes a distance calculation module between the simulated neutron radiation source and the simulated neutron monitor, a neutron dose equivalent rate calculation module and a neutron dose equivalent calculation module. The neutron dose equivalent rate calculation module pre-stores a set of neutron dose equivalent rate calculation formulas obtained by Monte Carlo model calculation. When the simulated neutron monitor obtains the name of the simulated neutron radiation source, the emissivity υ, and the energy E, the corresponding neutron dose equivalent rate calculation formula is retrieved from the neutron dose equivalent rate calculation module memory according to the distance X value between the simulated neutron radiation source and the simulated neutron monitor, and the neutron dose equivalent rate is obtained by substituting the parameters of the emissivity υ and the energy E.

[0091] The appearance, shape, alarm display mode and operation method of the above-mentioned simulated neutron monitor should be the same as the neutron radiation monitoring instrument actually used. In addition, in order to enable the simulated neutron monitor to actively send data packets during simulation training, the power switch of the simulated neutron monitor is designed to be dual-purpose without changing the original appearance and operation method of the simulated neutron monitor. When turning the power on and off, you need to press and hold the button for more than 3 seconds. If you press the power switch twice quickly and the length of each time is no more than 1 second, the simulated neutron monitor will send a data packet (such as ID, positioning information and measurement data, etc.) to the guidance center. The guidance center receives and stores the data packets sent by the simulated neutron monitor in real time, grasps the simulation training process, and assesses the simulation training results of the trainees.

[0092] Embodiment 1: Simulating neutron radiation source search training:

[0093] During the development, use, storage and transportation of radioactive sources, accidents of lost radioactive sources occur from time to time. Quickly finding lost neutron radioactive sources, alleviating public panic and reducing the hazards of nuclear radiation are important tasks that professional nuclear accident disposal teams often face.

[0094] The simulation of neutron radiation source search in this embodiment is carried out according to the following steps.

[0095] 1. Construction of simulation training ground

[0096] All equipment such as computers, positioning and mobile communication base stations in the command and control center are turned on, and the base stations broadcast positioning reference information. According to the specified training area, the commander sets the coordinate system on the computer, and can also send the positioning information of several points on the boundary of the area, such as the four corners of a square, to the computer, and the computer automatically sets the coordinate system of the training area. In order to achieve the training effect, dozens to hundreds of simulated neutron radiation sources are usually placed in different positions of the training field, and several simulated neutron radiation sources are turned on as needed, and this time ten simulated neutron radiation sources are set to work. Turn on the power switches of ten of the simulated neutron radiation sources, which can be turned on manually by the command and control team personnel or remotely by the command and control center computer. There is no feature of which simulated neutron radiation source is turned on, and the trainees cannot perceive it, which is equivalent to hiding the location of the simulated neutron radiation source being sought. The simulated neutron radiation source in working state obtains the reference positioning information provided by the Beidou RTK positioning base station through the mobile wireless communication base station broadcast. After the simulated neutron radiation source obtains the Beidou RTK positioning reference information, it then retrieves its own Beidou positioning information, and sends these two pieces of information to the RTK module of the simulated neutron radiation source for solution to obtain its own accurate positioning. Then the simulated neutron radiation source automatically transmits its accurate positioning (longitude, latitude, height or coordinates) and ID code information to the guidance and control center computer through the mobile wireless communication base station. All simulated neutron radiation sources are laid out, and the layout and positioning of simulated neutron radiation sources are completed, and the nuclear radiation simulation training field is built.

[0097] 2. Preset and broadcast the simulated neutron radiation source parameters

[0098] According to the training requirements, the commander clicks on the simulated neutron radiation source parameter setting page on the computer screen to set the nuclide names of ten simulated neutron radiation sources (n=10) and the energy and emission rate of each simulated neutron radiation source. Each simulated neutron radiation source with an ID number can be set with one or more nuclides, and each nuclide can be set with an energy and emission rate. At this time, the position, working status and set parameters of each simulated neutron radiation source in the simulated training field will be displayed on the computer screen. Immediately, the command and control center broadcasts the position and parameter information of all simulated neutron radiation sources. At this point, the simulated neutron radiation source parameters are preset.

[0099] The distribution of simulated neutron radiation sources is usually fixed when the simulated neutron radiation sources are arranged. If the distribution of simulated neutron radiation sources needs to be changed, it can be achieved by turning off the power of one or some simulated neutron radiation sources or setting the emissivity of the simulated neutron radiation sources to zero.

[0100] 3. Simulated neutron monitor enters the training ground

[0101] Participants enter the simulation training ground holding a simulated neutron monitor. Figure 4As shown in the figure, after the power-on self-test, the simulated neutron monitor enters the working state. The simulated neutron monitor obtains the positioning reference information through the mobile wireless communication base station. After receiving the positioning reference information, the simulated neutron monitor retrieves its own Beidou positioning information, and sends the two information to the Beidou RTK module of the simulated neutron monitor for solution, so as to obtain the accurate positioning information of the simulated neutron monitor itself, store it and send it to the computer of the guidance and control center, and the accurate position of the simulated neutron radiation source and the simulated neutron monitor is displayed on the computer screen of the guidance and control center. Acceleration sensors are designed in the simulated neutron monitor and the simulated neutron radiation source to detect the movement of the simulated neutron monitor and the simulated neutron radiation source. They are only allowed to send information once each time they move. This design controls the frequent sending of data information, avoids the congestion of the guidance and control center due to receiving massive data when the number of simulated neutron monitors and simulated neutron radiation sources is large, and also saves electricity.

[0102] 4. Finding simulated neutron radiation sources

[0103] At the beginning of the search, the simulated neutron monitor obtains the location, energy, emissivity and ID code information of ten simulated neutron radiation sources through mobile wireless communication base stations. Considering the different elevations of the ten simulated neutron radiation sources (due to topography), two calculation methods of the distance X are given. When the simulated neutron monitor and the simulated neutron radiation source are at the same elevation, the calculation result of formula (I) is the distance between the simulated neutron radiation source and the simulated neutron monitor.

[0104]

[0105] Where:

[0106] X—the distance between the simulated neutron monitor’s orthographic projection position and the simulated neutron radiation source at the same elevation (m);

[0107] r—the average radius of the Earth, equal to 6.371×10 6 rice;

[0108] Φ1—latitude of simulated neutron monitor;

[0109] Φ2—latitude of simulated neutron radiation source;

[0110] λ1—Longitude of the simulated neutron monitor;

[0111] λ2—the longitude of the simulated neutron radiation source;

[0112] When the simulated neutron monitor and the simulated neutron radiation source are at different altitudes, as shown in the attached Figure 5As shown, the point (Φ1, λ1, h1) where the simulated neutron monitor 5 is located is first projected to the elevation of a point (Φ2, λ2, h2) where a simulated neutron radiation source 4 is located to form an orthographic projection point 5′ (Φ1′, λ1′, h2). Substituting it into formula (1) for calculation, X′ is obtained. X′ is the straight-line distance between the orthographic projection point of the simulated neutron monitor 5 and the simulated neutron radiation source 4 at the same elevation. X′ is one right-angled side of the right triangle, and the difference in elevation between the simulated neutron monitor 5 and the simulated neutron radiation source 4 (h=|h1-h2|) is the other right-angled side of the right triangle. By using the Pythagorean theorem, the spatial distance X between the simulated neutron monitor 5 and the simulated neutron radiation source 4 can be calculated.

[0113]

[0114] Where:

[0115] X - the distance from the simulated neutron monitor to the simulated neutron radiation source (m);

[0116] X′ - the distance from the simulated neutron monitor's orthographic projection point to the simulated neutron radiation source at the same elevation (m);

[0117] h – The elevation difference between the simulated neutron monitor and the simulated neutron radiation source (m).

[0118] According to the above method, the spatial distance X1-X10 between the location of the simulated neutron monitor and the locations of 10 simulated neutron radiation sources at different elevations can be calculated.

[0119] Then, according to X1-X10, the corresponding formula (III) is called from the memory, and the neutron radiation dose equivalent rate generated by each simulated neutron radiation source in the simulated neutron monitor is calculated respectively.

[0120]

[0121] Where:

[0122] - the dose equivalent rate produced by a neutron source with energy E and yield υ at a distance of X meters;

[0123] υ - emission rate (neutron yield) of neutron source;

[0124] - the dose equivalent rate produced by a single neutron of energy E at a distance of X meters;

[0125] Finally, the neutron radiation dose equivalent rates generated by the ten simulated neutron radiation sources are summed up to obtain the total neutron radiation dose equivalent rate at the location of the simulated neutron monitor.

[0126] When the simulated neutron monitor moves to a new point, the simulated neutron monitor will substitute its own new point position information and the simulated neutron radiation source position and parameter information into formula (I) and formula (II) again to calculate the spatial distance X of the new point, and then substitute X into formula (III) to calculate the neutron radiation dose equivalent rate of the new point of the simulated neutron monitor, and sum to obtain the total neutron radiation dose equivalent rate of the new point. From formula (III), it can be seen that the smaller the distance X, the greater the neutron radiation dose equivalent rate. When the simulated neutron monitor moves along the direction of increasing total neutron radiation dose equivalent rate, it means that the simulated neutron monitor is getting closer to a simulated neutron radiation source with a larger radioactive intensity, until the simulated neutron radiation source is found. At this moment, the trainee operates the power switch of the simulated neutron monitor (press the power switch twice quickly in succession) to send the precise position, ID code and dose equivalent rate data of the simulated neutron monitor to the guidance center. In order to eliminate the influence of the found simulated neutron radiation source on the simulated neutron monitor, the found simulated radiation source can be shielded or the power supply of the found simulated neutron radiation source can be manually turned off. Next, the simulated neutron monitor continues to search for the remaining simulated neutron radiation sources according to the above method steps until all the arranged simulated neutron radiation sources are found.

[0127] If more than one simulated neutron monitor is used for training at the same time, each simulated neutron monitor can complete the above positioning and calculation process independently, thus shortening the time spent on finding all simulated neutron radiation sources. Trainees or teams with a reasonable route and short time in the search process can get high scores.

[0128] It should be noted that each time the total neutron radiation dose equivalent rate is measured, the simulated neutron monitor must obtain the positioning information of the simulated neutron radiation source and itself, and then calculate the spatial straight-line distance between the simulated neutron monitor and the simulated neutron radiation source, and then calculate the neutron radiation dose equivalent rate and the total neutron radiation dose equivalent rate. When the actual model of the instrument performs neutron radiation measurement dose equivalent rate measurement, it needs to stay for 1 second to several seconds, which is called the reading establishment time. The time it takes for a simulated neutron monitor to measure a total neutron radiation dose equivalent rate (the sum of the positioning time, the total radiation dose equivalent rate calculation time and other times) should be the same as the reading establishment time of the actual model of the neutron radiation instrument.

[0129] The positioning and total neutron radiation dose equivalent rate data of each measurement by the simulated neutron monitor can be automatically sent by the simulated neutron monitor or manually sent to the computer of the guidance center by the trainees. The computer can display the trainee's path and total neutron radiation dose equivalent rate information in real time, and can also display the time taken by the trainee to find the simulated neutron radiation source. The shorter the path and the shorter the time taken to find the simulated neutron radiation source, the better measurement method is, which is the basic principle of automatic assessment of the simulation training for finding neutron radiation sources.

[0130] The name, energy and emission rate of the simulated neutron radiation source can be set by the control center or manually preset by selecting the parameter manual button 43. Figure 2 The position information and parameter information of this simulated neutron radiation source can be directly acquired by the simulated neutron monitor through wireless communication, thereby completing the detection of the neutron radiation dose equivalent rate and further completing the task of finding the simulated neutron radiation source.

[0131] Example 2: Training on the definition of neutron radioactive contamination area in nuclear radiation field simulation:

[0132] After a nuclear accident occurs, neutron radiation is very harmful to the human body. According to the neutron radiation dose equivalent rate, the area where the nuclear accident occurred is usually divided into severe nuclear radiation contamination areas and general nuclear radiation contamination areas. Personnel and equipment are prohibited from entering the severe nuclear radiation contamination area. The basis for dividing the boundary line between the severe nuclear radiation contamination area and the general nuclear radiation contamination area is whether the neutron radiation dose equivalent rate reaches the safety critical value. If the many points in the simulated neutron radioactive contamination area that reach the safety critical value are connected into a line, it is the boundary line of the simulated severe nuclear radiation contamination area. The area surrounded by the boundary line is the simulated severe nuclear radiation contamination area.

[0133] The construction of the simulated training ground in the second embodiment is the same as that in the first embodiment.

[0134] The simulation training methods in the second embodiment can be divided into two types:

[0135] The first simulation training method is that the simulated neutron radiation source arranged in the simulation training field is preset with the radiation source name, energy and emissivity through the parameter selection manual button. The intensity decay law of the simulated neutron radiation source is the same as the intensity decay law of the real radiation source. After the simulated neutron radiation source is turned on, its location information and parameter information are broadcasted through the mobile wireless communication base station.

[0136] Several trainees in the same team held simulated neutron monitors and stood around the simulated nuclear radiation training ground according to instructions. The commander gave the safety critical value of the neutron radiation dose equivalent rate and instructed the measurement training to start. The trainees held the simulated neutron monitor, adjusted their position and direction, and quickly measured to find the point where the neutron radiation dose equivalent rate was the safety critical value. Every time a neutron radiation dose equivalent rate was measured at a safety critical value point (within the specified relative error range), the power switch of the simulated neutron monitor was manually and quickly triggered twice, and the data packet consisting of the location information, ID code, and measurement value of the point where the simulated neutron monitor was located was sent to the guidance and dispatching center computer through the mobile wireless communication base station. The guidance and dispatching center computer received and stored the data packet and displayed it on its screen. After each measurement, the team trainees quickly sent a data packet consisting of the location information, ID code, and measurement value to the guidance and dispatching center computer, and also made physical marks on the ground of the simulated training ground (such as inserting a warning red flag or placing a tumbler device with sound and light alarm and positioning functions). After the team members complete the required number of measurements in the specified area, they can connect the points with the same neutron radiation dose equivalent rate value on the computer screen of the guidance center to display the boundary line of the simulated radioactive contamination area measured on site. If the physical marks made in the simulation training field are connected, the scope of the simulated radioactive contamination area will be marked.

[0137] The relative error between each measurement data of the trainees and the given safety critical dose equivalent rate value should be within the specified range (for example, ±20%). If it exceeds this range, it will be regarded as not meeting the requirements and the corresponding score will be deducted during the assessment. During the assessment, it is necessary to consider not only the time for all trainees in the team to complete the measurement, but also the sum of the absolute values ​​of the errors of each member's multiple measurements, and comprehensively evaluate the results.

[0138] It should be noted that the time required for a simulated neutron monitor to measure the total neutron radiation dose equivalent rate produced by multiple simulated neutron radiation sources should be basically the same as the measurement (reading establishment) time of an actual model of neutron radiation monitor.

[0139] The advantage of this simulation training method is that the simulated neutron monitor directly obtains the location and parameter information of the simulated neutron radiation source, and there is no need for the guidance center computer to set the simulated neutron radiation source parameters in advance, nor is there a need for the guidance center computer to perform theoretical calculations on the relevant data of the simulation training field. This simulation training method is suitable for team self-training.

[0140] The second method of simulation training in the second embodiment is that the control center presets the simulated neutron radiation source parameters, calculates and establishes the coordinate system and the simulated space radiation field, and sends the corresponding neutron dose equivalent rate data as the measurement data of the simulated neutron monitor according to the three-dimensional positioning information provided by the simulated neutron monitor.

[0141] The first step is to build a simulation training ground:

[0142] In order to adapt to the simulated measurement of personnel on foot and drones, the simulation training ground is set as a three-dimensional cube of 100 meters × 100 meters × 100 meters, and the simulation training ground is divided into 10 9 A cube of 1 dm x 1 dm x 1 dm is formed, and the center point of each cube is used as the characteristic point of the cube. In this way, the spatial point position (longitude, latitude and elevation) of each simulated neutron radiation source arranged in the simulated training field falls into a cube of the three-dimensional simulated neutron radiation field, and the center point (longitude, latitude and elevation) of the cube is regarded as the point position of the simulated neutron radiation source. Similarly, when the spatial point position (longitude, latitude and elevation) of each simulated neutron monitor (carried by personnel, drones or robots) entering the simulated training field falls into a cube of the three-dimensional simulated training field, the center point (longitude, latitude and elevation) of the cube is regarded as the point position of the simulated neutron monitor.

[0143] Step 2: Establish a simulated neutron radiation field:

[0144] When the simulated neutron radiation sources are arranged in the simulated training field, the computer of the guidance center calculates the spatial distance between each simulated neutron radiation source and each cube center point (feature point) in the three-dimensional simulated training field according to the number, location, name, energy and emissivity of the simulated neutron radiation sources, and calculates the neutron radiation dose equivalent rate of each cube center point according to formula (3). The total neutron radiation dose equivalent rate of each cube center point in the three-dimensional simulated training field is obtained by accumulating and summing. Then, 10 9 The total neutron radiation dose equivalent rate data of each cube center point is generated into a spreadsheet and stored in the computer of the control center for quick query.

[0145] The third step is to simulate the neutron radiation dose equivalent rate measurement:

[0146] The trainees enter the simulation training ground holding a simulated neutron monitor and start the self-test. First, the simulated neutron monitor obtains the positioning reference data of Beidou RTK through the mobile wireless communication base station, and then obtains its own Beidou positioning information, which is sent to its own Beidou RTK module for joint solution to obtain the precise positioning information of the simulated neutron monitor itself, and then sent to the guidance and control center through wireless communication. The computer of the guidance and control center determines the cube position of the simulated neutron monitor in the three-dimensional simulation training ground based on the precise positioning information transmitted by the simulated neutron monitor, and obtains the simulated total neutron radiation dose equivalent rate data corresponding to the center point of the cube position by looking up the table, and sends it to the simulated neutron monitor. After receiving the total neutron radiation dose equivalent rate data information, the simulated neutron monitor sends it to the display for display, and if the value exceeds the alarm threshold, an alarm sound is issued.

[0147] In the second mode of simulation training in the second embodiment of the present invention, a three-dimensional simulated radiation field constructed by a computer of the guidance and control center can intuitively display the positions of the simulated neutron radiation sources and the simulated neutron monitors in the simulation training field on the computer screen of the guidance and control center. The values ​​of the parameters set by the guidance and control center for each simulated neutron radiation source (such as the name, energy, and emissivity of the simulated neutron radiation source) can also be displayed on the computer screen.

[0148] When the trainees enter the simulated radiation training field holding a simulated neutron monitor, each time they stop at a measuring point and send the location information to the command center, the command center will look up the table, send the total neutron radiation dose equivalent rate data corresponding to that point to the simulated neutron monitor and display it. Once the simulated neutron monitor shows the total neutron radiation dose equivalent rate reaching the safety critical value (within the specified error range), the trainees will send the location, ID code and displayed total neutron radiation dose equivalent rate value of the simulated neutron monitor to the command center computer, which will record and display it.

[0149] If, on the computer screen of the guidance and control center, the coordinate points at a height of 1 meter relative to the ground and with the same total neutron radiation dose equivalent rate that meets the error requirements are connected into a line, a theoretical calculated boundary line of the simulated neutron radioactive contamination area with a safety critical value is formed, as shown in the attached figure. Figure 6 Shown P 计算 Indicated by solid boundary.

[0150] The simulated radioactive contaminated area boundary line P calculated by the guidance center computer 计算 The simulated radioactive contaminated area boundary line P measured on site by the trainees 实测 For comparison, see Appendix Figure 6 , the simulation training results can be judged.

[0151] The disadvantage of the second method of simulation training in the second embodiment is that the simulated neutron monitor needs to continuously send positioning information to the guidance center to obtain the total neutron radiation dose equivalent rate value of the new point. Every time a point with a total neutron radiation dose equivalent rate of a safe boundary value is measured, it needs to communicate with the guidance center computer multiple times, and the power consumption of the simulated neutron monitor will become quite large. When many simulated neutron monitors continuously send information to the computer, the computer needs to have quite high performance to quickly process the massive amount of information.

[0152] In the two simulation training methods given in the second embodiment, the simulated neutron monitor can also be mounted on a ground walking robot. The simulated neutron monitor is 1 meter above the ground and is remotely controlled by the trainees.

[0153] Example 3: Aerial survey training of simulated neutron monitor carried by unmanned aerial vehicle:

[0154] The first step is to build a simulation training ground:

[0155] According to the second simulation training method in Example 2, a 100m×100m×100m three-dimensional cube-shaped nuclear radiation simulation training field is established, and all equipment such as the guidance and control center computer, positioning and mobile wireless communication base station are turned on, and the positioning and communication base station broadcasts positioning reference information. The coordinate system of the drone detection area is set on the computer according to the specified simulation training area.

[0156] The second step is to construct a simulated neutron radiation field:

[0157] Arrange 1-n simulated neutron radiation sources at different locations (with different longitude, latitude and altitude) in the simulated training ground, turn on the power switches of several of them, and the simulated neutron radiation sources in working state obtain the positioning reference information of the Beidou RTK positioning base station through the mobile wireless communication base station broadcast, and the computer of the command and control center presets the simulated neutron radiation source name, energy and emissivity for each simulated neutron radiation source.

[0158] The third step is to simulate aerial survey training:

[0159] UAVs carrying simulated neutron monitors enter the airspace above nuclear radiation contaminated areas. Figure 7 As shown, according to the planned altitude and path, point-by-point hovering measurements are performed over the nuclear radiation simulation training ground.

[0160] The simulated neutron monitor carried by the unmanned aerial vehicle obtains and stores the ID, positioning longitude and latitude information (Φi, λi, hi, i=1, 2, ...n), name of the radiation source, energy and emissivity information of each simulated neutron radiation source through a mobile wireless communication base station. Since the location of the simulated neutron monitor onboard the unmanned aerial vehicle is different from the location of the simulated neutron radiation source, the aerial location of the simulated neutron monitor onboard the unmanned aerial vehicle is first projected to the same elevation of each simulated neutron radiation source to form the longitude, latitude and elevation information of the projection point (Φp1, λp1, hi), and then substitute the longitude, latitude and elevation information of the simulated neutron radiation source into formula (I) to obtain the distance X11-Xnn (meters) between the orthographic projection point of the unmanned aerial vehicle simulated neutron monitor and the location of the simulated neutron radiation source at the same elevation. Then, substitute X11-Xnn and the elevation difference h (the relative elevation between the location of the simulated neutron monitor onboard the unmanned aerial vehicle and its orthographic projection point) into formula (II) to obtain the spatial distance X1-Xn between the simulated neutron monitor onboard the unmanned aerial vehicle and the simulated neutron radiation source and store it.

[0161] Then substitute X1-Xn into formula (III) respectively to obtain the neutron radiation dose equivalent rate generated by the simulated neutron radiation source 1-n at the location of the simulated neutron monitor on the unmanned aerial vehicle. Finally, sum up the total neutron radiation dose equivalent rate and transmit it to the guidance and control center via wireless. After this measurement is completed, the unmanned aerial vehicle flies to the next or more locations and continues the above steps to complete the measurement of the neutron radiation dose rate at the next or more locations. The time spent on the measurement process should be basically the same as the measurement (reading establishment) time of the actual model aerial survey instrument.

[0162] In the above calculation process, if the altitude of the hovering point of the simulated neutron monitor on the unmanned aerial vehicle is lowered to an altitude point 1 meter above the ground, and then the positioning information at the point 1 meter above the ground is substituted into formula (2) and formula (3) to calculate the total neutron radiation dose equivalent rate, when the points where the calculated total neutron radiation dose equivalent rate reaches the safety critical value that meets the error requirements are connected, the boundary line of the neutron radiation contamination area on the ground of the simulated training ground can be obtained.

[0163] Example 4: Real-time measurement simulation training of personal neutron radiation dose:

[0164] Under the scenario of searching for a simulated neutron radiation source given in the first embodiment, a simulated neutron monitor is used to achieve real-time measurement of personal neutron cumulative dose.

[0165] When the trainee enters the simulation training field holding a simulated neutron monitor, the time taken from turning on the instrument or completing the previous radiation dose equivalent rate measurement of the simulated neutron monitor to completing the current radiation dose equivalent rate measurement is multiplied by the current radiation dose equivalent rate to obtain the personal neutron radiation dose equivalent received by the trainee in this simulated neutron radiation measurement. The personal radiation dose received in each neutron radiation measurement during the entire training process is added together to obtain the personal cumulative dose equivalent received by the trainee during this simulation training. When the personal cumulative dose equivalent reaches the threshold that is harmful to the human body, the simulated neutron monitor can alarm. During the simulation training process, the simulated neutron monitor can also display the personal cumulative neutron dose equivalent value in real time.

Claims

1. A neutron radiation field simulation method, characterized in that: Using Beidou RTK positioning technology and computer technology, a three-dimensional simulated neutron radiation field consisting of several regular cubes is constructed on the training ground. In the three-dimensional simulated neutron radiation field, each regular cube center point has a certain longitude, latitude and elevation. The spatial position (longitude, latitude and elevation) of the center point of any cube A in the three-dimensional space is connected with the spatial position (longitude, latitude and elevation) of the center point of any cube B in the three-dimensional space. If the center point of cube A and the center point of cube B are at the same elevation, the plane distance X between the two center points can be calculated by substituting it into formula (1). Where: X—the plane distance from the center point of cube A to the center point of cube B (meters); r—the average radius of the Earth, equal to 6.371×10 6 rice; Φ1—the latitude of the center point of cube A; Φ2—the latitude of the center point of cube B; λ1—the longitude of the center point of cube A; λ2—the longitude of the center point of cube B; If the center point of cube A and the center point of cube B are not at the same elevation, substitute into formula (2) to calculate the spatial distance X between the two center points. Where: X - the straight-line distance from the center of cube A to the center of cube B (meters); X′ – the distance between the orthographic projection point at the same elevation of the center point of cube A and the center point of cube B (meters); h – height difference between the center of cube A and the center of cube B (meters); Assume that the simulated neutron radiation source is an isotropic monoenergetic neutron point source in the air, and divide the energy of the monoenergetic neutron point source from 0-20 MeV into 100 logarithmic evenly, that is, perform 100 monoenergetic isotropic neutron point source Monte Carlo calculations, and use the Monte Carlo particle transport method to calculate the distance from the neutron source X0-X m The neutron dose equivalent rate at m points within a meter (each point is 1 meter apart), that is, each point in space can obtain the dose equivalent rate results corresponding to 100 energies. Finally, the 100 energy-dose equivalent rate data at each point are spline interpolated in turn to obtain a fitting quadratic or high-order polynomial Thus, m neutron dose equivalent rate calculation formulas are obtained and stored in the memory for neutron dose equivalent rate calculation in neutron radiation monitoring simulation training; after the distance, neutron energy and emission rate are given, the neutron dose equivalent rate is calculated as shown in formula (III); Where: - the neutron dose equivalent rate produced by a neutron source with energy E and emissivity υ at a distance of X meters; υ - the emissivity (neutron yield) of the neutron source; - the dose equivalent rate produced by a single neutron of energy E at a distance of X meters; When the simulated neutron source is located at the center point of the three-dimensional simulated neutron radiation field cube B, the distance between the center point of the three-dimensional simulated neutron radiation field cube A and the center point of the simulated neutron source cube B is X. i (i=0,1,2,...m) meters, then call the Xth memory from the memory i The dose equivalent rate generated by the simulated neutron source B at point A can be calculated by using the formula for calculating the neutron dose equivalent rate. If n simulated neutron radiation sources with energy E and emissivity υ are placed at different cube center points in three-dimensional space, and are substituted into formula (I) and formula (II) respectively, the distance X between the center point of the n simulated neutron radiation sources and the center point of any cube P in the three-dimensional space (assuming that the simulated neutron monitor is at the center point of the cube P) can be calculated. i , and then substitute them into formula (III) to obtain the simulated neutron dose equivalent rate formed by each simulated neutron radiation source point source at the center of the cube P Then add up the sum to get the total neutron dose equivalent rate of n simulated neutron radiation source points at the center of the cube P.

2. A neutron radiation field simulation method according to claim 1, characterized in that: The three-dimensional simulated neutron radiation field is based on precise Beidou RTK spatial positioning technology, wireless communication technology and computer technology. On a training ground several meters long and several meters wide, a three-dimensional simulated neutron radiation field consisting of several cubes with a side length of 1 decimeter is constructed. The center point of each cube corresponds to each spatial position (longitude, latitude and elevation) positioned by Beidou RTK. The simulated neutron radiation source and the simulated neutron monitor located in the three-dimensional simulated neutron radiation field determine their spatial position through Beidou RTK positioning technology. When the spatial position (longitude, latitude and elevation) of a certain simulated neutron radiation source falls into a certain cube of the three-dimensional simulated neutron radiation field, The center point (longitude, latitude and elevation) of the cube is regarded as the location of the simulated neutron radiation source. Similarly, when the spatial location (longitude, latitude and elevation) of a simulated neutron monitor falls into a cube of the three-dimensional simulated neutron radiation field, the center point (longitude, latitude and elevation) of the cube is regarded as the location of the simulated neutron monitor. Substitute the location information of the center point of cube A where the simulated neutron monitor is located and the center point of cube B where the simulated neutron radiation source is located into formula (1) and formula (2) to calculate the spatial distance X between the simulated neutron radiation source and the simulated neutron monitor, and then substitute it into formula (3) to calculate the neutron dose equivalent rate at the location of the simulated neutron monitor. When n simulated neutron radiation sources are arranged in the three-dimensional simulated neutron radiation field, the dose equivalent rate value generated by each simulated neutron source is obtained by substituting them into the formula one by one. Then, the dose equivalent rates generated by n simulated neutron radiation sources at the point where the simulated neutron monitor is located are accumulated and summed to obtain the total neutron dose equivalent rate at the point where the simulated neutron monitor is located.

3. A neutron radiation monitoring simulation training system, which comprises a neutron radiation monitoring simulation training guidance center (hereinafter referred to as the guidance center), a positioning and communication base station, a neutron (nuclear) radiation simulation training field (hereinafter referred to as the simulation training field), a simulated neutron radiation source and a simulated neutron monitor, and is characterized in that: The guidance and control center includes a computer, several software modules and functional modules; the software modules include a simulated neutron radiation source and a simulated neutron monitor working state detection and control module, a simulated neutron radiation source setting module, a simulated neutron radiation field calculation and evaluation module, a simulated training subject setting module, a trainee training assessment module, and a trainee and simulation equipment information management module; the functional modules include a face recognition module and a QR code recognition module; The positioning and communication base station includes a Beidou RTK positioning reference station, a mobile wireless communication base station, and an optical fiber switch. The Beidou RTK positioning reference station and the mobile wireless communication base station are respectively connected to the optical fiber switch by optical signals or electrical signals; The simulation training ground is a ground and space area with specific topography and a certain area that can meet the requirements of neutron radiation monitoring simulation training; The number of the simulated neutron radiation sources is either one or any number; the simulated neutron radiation source is composed of a mobile communication module, a Beidou RTK positioning module, a single-chip microcomputer, an acceleration sensor, a display module, an initial parameter storage module, a parameter selection manual button and a power supply, and the mobile communication module, the Beidou RTK positioning module, the display module, the initial parameter storage module, and the parameter selection manual button are all electrically connected to the single-chip microcomputer, and the power supply provides electrical energy for each of the above components and the single-chip microcomputer; The simulated neutron monitor is composed of a mobile communication module, a Beidou RTK positioning module, a single-chip microcomputer, a software module, an acceleration sensor, an alarm and display, an operation panel and a power supply. The mobile communication module, the Beidou RTK positioning module, the acceleration sensor, the alarm and display, and the operation panel are all electrically connected to the single-chip microcomputer. The software module is pre-input into the single-chip microcomputer. The power supply provides electrical energy for the above-mentioned components and the single-chip microcomputer. The appearance, shape, weight, alarm mode, response time and operation panel of the simulated neutron monitor are the same as those of the neutron monitor actually used. The computer of the above-mentioned command and control center is connected to the optical fiber switch in the positioning and communication base station through an Ethernet cable or optical fiber in the form of electrical or optical signals. The Beidou RTK positioning module in the above-mentioned simulated neutron radiation source and simulated neutron monitor obtains positioning reference information from the Beidou RTK positioning reference station. The wireless communication module in the above-mentioned simulated neutron radiation source and simulated neutron monitor maintains communication with the mobile wireless communication base station.

4. A neutron radiation monitoring simulation training system according to claim 3, characterized in that: The simulated neutron radiation source initial parameter storage module stores the name, energy E and emissivity υ of the simulated neutron radiation source preset by the computer of the guidance and control center; the name, energy E and emissivity υ of the simulated neutron radiation source can be assigned wirelessly by the guidance and control center, or can be manually set through the parameter selection manual button.

5. A neutron radiation monitoring simulation training system according to claim 3, characterized in that: The software modules in the simulated neutron monitor include a distance calculation module between the simulated neutron radiation source and the simulated neutron monitor, a neutron dose equivalent rate calculation module and a neutron cumulative dose calculation module.

6. A nuclear radiation monitoring simulation training system according to claim 5, characterized in that: The memory in the neutron dose equivalent rate calculation module of the simulated neutron monitor pre-stores a set of neutron dose equivalent rate calculation formulas obtained by Monte Carlo model calculation. When the simulated neutron monitor obtains the name of the simulated neutron radiation source, the emission rate v, and the energy E, the corresponding neutron dose equivalent rate calculation formula is retrieved from the memory according to the distance X value between the simulated neutron radiation source and the simulated neutron monitor, and the neutron dose equivalent rate is obtained by substituting the emission rate v and the energy E.

7. An application of a neutron radiation monitoring simulation training system, characterized in that: First, build a neutron radiation monitoring simulation training system: The system comprises a guidance and control center, a positioning and communication base station, a simulation training ground, a simulation neutron radiation source and a simulation neutron monitor. The guidance and control center comprises a computer, a plurality of software modules and a functional module; the positioning and communication base station comprises a Beidou RTK positioning base station, a wireless communication base station and an optical fiber switch, and the Beidou RTK positioning base station and the mobile wireless communication base station are respectively connected to the optical fiber switch by optical or electrical signals; the simulation training ground can meet the requirements of nuclear radiation monitoring simulation training and has a specific topography and a determined area; the simulation neutron radiation source comprises a mobile wireless communication module, a Beidou RTK positioning module, a single-chip microcomputer, an acceleration sensor, a display module, an initial parameter storage module and a power supply, and the mobile wireless communication module, the Beidou RTK positioning module, the display module and the initial parameter storage module are all electrically connected to the single-chip microcomputer, and the power supply provides electrical energy for the above-mentioned components and the single-chip microcomputer; the simulation neutron monitor It is composed of a mobile wireless communication module, a Beidou RTK positioning module, a single-chip computer, a software module, an acceleration sensor, an alarm and display, an operation panel and a power supply. The mobile wireless communication module, the Beidou RTK positioning module, the acceleration sensor, the alarm and display, and the operation panel are all electrically connected to the single-chip computer. The software module is pre-input into the single-chip computer. The power supply provides electrical energy for the above components and the single-chip computer. The appearance, shape, weight, alarm mode, response time and operation panel of the simulated neutron monitor are the same as those of the neutron monitor actually used. The computer of the above-mentioned simulation training and guidance center is connected to the optical fiber switch in the positioning and communication base station through an Ethernet cable or an optical fiber in the form of an electrical or optical signal. The Beidou RTK positioning module in the above-mentioned simulated neutron radiation source and the simulated neutron monitor obtains positioning reference information from the Beidou RTK positioning reference station. The above-mentioned simulated neutron radiation source and the wireless communication module in the simulated neutron monitor maintain communication with the mobile wireless communication base station. Second, build an outdoor neutron radiation monitoring simulation training field: Select an outdoor venue with specific terrain and area as a simulation training field, set up a Beidou RTK positioning base station and a mobile wireless communication base station, and after the computer of the command and control center is powered on, the Beidou RTK positioning base station will transmit the Beidou positioning reference information to the mobile wireless communication base station through the optical fiber switch, and the wireless communication base station will broadcast the Beidou positioning reference information; Third, simulate the layout of neutron radiation sources and their parameter settings: Each simulated neutron radiation source has a unique identity code (ID). When the simulated neutron radiation source is turned on and powered on, it is in a simulated radioactive working state. One of the ways to arrange and set parameters of simulated neutron radiation sources: When the personnel of the guidance and dispatching center arrange several simulated neutron radiation sources at different points in the simulated training field according to the requirements of the simulated training and turn them on, they will then preset the name, emissivity and energy of the simulated neutron radiation sources through the manual button of the parameter selection of each simulated neutron radiation source. After the simulated neutron radiation source is turned on for self-test, the simulated neutron radiation sources at each point will perform joint calculation by receiving the positioning reference information of Beidou RTK and combining it with the Beidou information obtained by itself, and then send their respective ID codes, Beidou precise positioning information and preset parameter information through the wireless communication module; The second method of simulating neutron radiation source layout and parameter setting: Several simulated neutron radiation sources are arranged at various points in the outdoor simulation training field according to the simulation training requirements. After the simulated neutron radiation sources are powered on for self-test, the simulated neutron radiation sources at each point receive the positioning reference information of Beidou RTK and combine it with the Beidou information obtained by itself to perform joint calculation to obtain their own centimeter-level precise positioning information, and send their own ID codes and precise positioning information (longitude, latitude and altitude) to the guidance and control center. After the guidance and control center receives the ID codes and precise positioning information of the simulated neutron radiation sources at each point, it immediately sets the parameters of each simulated neutron radiation source (neutron radiation source name, energy E, emissivity ν) in the guidance and control center computer, and sends the set parameters to each simulated neutron radiation source, and stores them in the initial parameter storage module. Each simulated neutron radiation source then sends its own ID code, Beidou precise positioning and parameter information through the mobile wireless communication base station; In order to intuitively display the simulated training field and the simulated training effect, a simulated three-dimensional neutron radiation field is constructed on the computer of the guidance and control center and displayed on the computer screen, and the simulated three-dimensional neutron radiation field is divided into a number of 1 decimeter × 1 decimeter × 1 decimeter cubes. When the simulated neutron radiation source is arranged in the simulated training field, the computer of the guidance and control center calculates the total simulated neutron dose equivalent rate data of each cube center point of the simulated three-dimensional neutron radiation field according to the location of the simulated neutron radiation source and the preset parameters using formula (I), formula (II) and formula (III), and stores the data in the electronic spreadsheet of the computer of the guidance and control center. When the location of the simulated neutron monitor is within a certain cube range, the computer of the guidance and control center sends the total simulated neutron dose equivalent rate data of the cube center point to the simulated neutron monitor through wireless communication; Fourth, the simulated neutron monitor enters the simulated training field for practical training. Each simulated neutron monitor has a unique identity code (ID). When the simulated neutron monitor is turned on and powered on, the simulated neutron monitor is in the simulated detection working state: (1) Finding simulated neutron radiation sources: After a simulated neutron monitor at a certain spatial position in the simulated training ground is turned on, on the one hand, it receives the positioning reference information sent by the Beidou RTK base station, and performs joint calculation with its own Beidou positioning information to obtain the precise position information (longitude, latitude and elevation) of the point where the simulated neutron monitor is located, and uploads the precise position information of the point to the guidance and control center. On the other hand, it receives the parameters of each simulated neutron radiation source (simulated neutron source name, energy, emissivity) and the precise position information of the point where it is located broadcast by the guidance and control center, and substitutes them into formula (1) and formula (2) to calculate the spatial distance X between the simulated neutron monitor and each simulated neutron radiation source. The single-chip microcomputer in the simulated neutron monitor then calls out formula (3) corresponding to the distance X from the memory, and then substitutes the parameters related to the simulated neutron radiation source into the calculation to obtain the neutron dose equivalent rate generated by the simulated neutron radiation source at this specific distance X. Finally, the total neutron dose equivalent rate at the precise position of the simulated neutron monitor is obtained by accumulating and summing. The acceleration sensor in the simulated neutron monitor can sense the movement and stop status of the simulated neutron monitor. Each time it stops, a new position information is calculated and provided. When the simulated neutron monitor moves to a new point, the simulated neutron monitor will jointly solve the Beidou positioning information of the new point with the received Beidou RTK positioning reference information to obtain the precise positioning information of the new point, and then repeat the above calculation process to obtain the total neutron dose equivalent rate of the new point. When the simulated neutron monitor follows the total neutron dose equivalent rate The simulated neutron monitor moves in the direction of increasing values, which means that the simulated neutron monitor is gradually approaching a certain simulated neutron radiation source. When a certain simulated neutron radiation source is found, the precise position of the simulated neutron radiation source found is reported to the guidance center by operating the power switch of the simulated neutron monitor (pressing the power switch twice in quick succession). Subsequently, the power of the simulated neutron radiation source is either turned off or all information of the simulated neutron radiation source found is automatically shielded. When the monitor continues to move in the direction and route of the gradually increasing total neutron dose equivalent rate value displayed on the simulated neutron monitor, the next simulated neutron radiation source can be found until all simulated neutron radiation sources are found. (2) Determine the neutron radiation contamination area: In the above scenario (1) of searching for a simulated neutron radiation source, when the total neutron dose equivalent rate value observed by the trainee on the simulated neutron monitor reaches the safety critical value set for the simulated training subject, the trainee sends the ID, neutron dose equivalent rate and precise location information data packet of the simulated neutron monitor at that moment to the guidance center through the simulated neutron monitor (by pressing the power switch twice in quick succession) and makes a physical mark at that location (such as inserting a small red flag or placing a tumbler device with positioning and sound and light alarm functions); When the simulated neutron monitor moves along the same direction and route as the total neutron radiation dose equivalent rate value (safety critical value), and transmits the precise position information of each point reaching the total neutron radiation dose equivalent rate value (safety critical value) to the control center, on the computer screen of the control center, if these points with the same total neutron radiation dose equivalent rate value (safety critical value) are connected into a line, the boundary line of the simulated neutron radioactive contamination area measured on site by the trainees can be obtained; if the physical marks made by the trainees on the simulated training field are connected, the scope of the simulated neutron radioactive contamination area can be marked on site; In the process of determining the neutron radiation contamination area, the simulated neutron monitor can be carried by the trainees into the simulated training field to complete the entire simulated training process; the simulated neutron monitor can also be carried on a drone, which hovers and measures point by point at a certain height in the simulated training field, and then flies along the specified direction and route to complete the entire simulated training process; the simulated neutron monitor can also be carried on a ground robot, so that the simulated neutron monitor is 1 meter above the ground, measures point by point, and then moves along the specified direction and route to complete the entire simulated training process; (3) Real-time monitoring of personal neutron dose equivalent: In the same scenario as (1) of finding a simulated neutron radiation source, a simulated neutron monitor is used to realize real-time measurement of personal cumulative dose equivalent. That is, the time taken from the start-up of the instrument or the completion of the previous total neutron dose equivalent rate measurement of the simulated neutron monitor to the completion of the current total neutron radiation dose equivalent rate measurement is multiplied by the current total neutron dose equivalent rate to obtain the personal neutron radiation dose equivalent received by the trainee in this neutron radiation measurement. The personal neutron radiation dose equivalent received by the trainee in each neutron radiation measurement during the entire training process is added together to obtain the personal cumulative dose equivalent received by the trainee during this simulated training. When the personal cumulative dose equivalent reaches the threshold value that is harmful to the human body, the simulated neutron monitor can alarm. During the simulated training process, the simulated neutron monitor can also display the personal cumulative dose equivalent value in real time.

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