A 4π viewing angle radiation source rapid positioning method, device and storage medium

Abstract

The present invention provides a method, device and storage medium for rapid positioning of a radioactive source at a 4π viewing angle, and relates to the field of radiation detection. The method comprises: using a scintillation crystal as a radiation detector, and using the plurality of optical sensors to continuously collect a plurality of groups of photoelectric signals; wherein each group of photoelectric signals includes a signal strength value received by each optical sensor; determining the nuclide type of the radioactive source according to the plurality of groups of photoelectric signals; determining the generation position of the scintillation light corresponding to each group of photoelectric signals according to the plurality of signal strength values ​​in each group of photoelectric signals and the positions of the plurality of optical sensors; determining the direction of the radioactive source relative to the detector according to the generation position of the scintillation light corresponding to the plurality of groups of photoelectric signals and the nuclide type. The direction of the radioactive source relative to the detector can also be determined directly using the plurality of groups of photoelectric signals and the positions of the plurality of optical sensors. The method can determine the position of the radioactive source simply, quickly and accurately at a 4π viewing angle.

Description

Technical Field

[0001] The present invention relates to the field of radiation detection, and in particular to a method, a device and a storage medium for quickly locating a radiation source at a 4π viewing angle. Background Art

[0002] When an emergency occurs in nuclear power plants and radiation facilities, accurate and reliable radiation monitoring is crucial. Among them, how to find lost radioactive isotopes and radioactive contaminants and other radioactive materials is a technical issue that people pay close attention to.

[0003] At present, handheld nuclide identifiers are usually used to detect radioactive dose rates and radionuclide information to find lost radioactive materials, but this requires manual source search to find the location of the radioactive material, which is not only inefficient and inaccurate, but also poses safety risks. In addition, although the coded aperture gamma camera can detect the distribution of radioactive materials, the detection angle of view is very limited, usually only 40°. Although the Compton camera can detect the distribution of radioactive materials within a wide range of viewing angles, it is very expensive and is not suitable for the detection of gamma radiation sources with energies below 250keV. Therefore, there is an urgent need for a device that can quickly locate radioactive materials at any viewing angle and produce good energy resolution and position resolution. Summary of the invention

[0004] In view of this, an object of the present invention is to provide a method, device and storage medium for quickly locating a radiation source with a 4π viewing angle, which can simply, quickly, accurately and comprehensively determine the location of the radiation source.

[0005] In order to achieve the above purpose, the technical solution adopted by the embodiment of the present invention is as follows:

[0006] In a first aspect, the present invention provides a 4π viewing angle radiation source rapid positioning method, which is applied to a 4π viewing angle radiation source rapid positioning device, wherein the 4π viewing angle radiation source rapid positioning device comprises a three-dimensional scintillator and a plurality of optical sensors, wherein the plurality of optical sensors are dispersedly arranged on the surface of the three-dimensional scintillator; when the radiation of the radiation source generates scintillation light in the three-dimensional scintillator, the optical sensor is used to collect a photoelectric signal corresponding to the scintillation light; wherein the 4π viewing angle radiation source rapid positioning method comprises: continuously collecting a plurality of groups of photoelectric signals by using the plurality of optical sensors; wherein each group of photoelectric signals comprises a plurality of signal intensity values, and a photo sensor obtains a signal intensity value by light collection in one interaction; determining the nuclide type of the radiation source according to the plurality of groups of photoelectric signals; and determining the orientation information of the radiation source according to the nuclide type and the plurality of groups of photoelectric signals.

[0007] In a second aspect, the present invention provides a 4π viewing angle radiation source rapid positioning device, comprising: a three-dimensional scintillator, a plurality of optical sensors and a data reading and processing module, wherein the plurality of optical sensors are dispersedly arranged on the surface of the three-dimensional scintillator; when the radiation source generates scintillation light in the three-dimensional scintillator, the optical sensor is used to collect the photoelectric signal corresponding to the scintillation light; the data reading and processing module is used to control the plurality of optical sensors to implement the method described in any one of the embodiments in the first aspect.

[0008] In a third aspect, the present invention provides a computer-readable storage medium comprising instructions, which, when executed on a data reading and processing module of a 4π viewing angle radiation source rapid positioning device, enables the 4π viewing angle radiation source rapid positioning device to implement the method described in any one of the embodiments in the first aspect.

[0009] It should be understood that the present application utilizes the attenuation characteristics of gamma photons in a three-dimensional scintillator and the propagation characteristics of scintillation light in a three-dimensional scintillator to design a three-dimensional scintillator and a plurality of light sensor structures, and the detection viewing angle of the gamma radiation source can cover the entire 4π range. Specifically, in the method embodiment described in the first aspect above, a plurality of light sensors are dispersedly arranged on the surface of the three-dimensional scintillator, so that the 4π viewing angle radiation source rapid positioning device can sense the rays generated by the radiation source in various directions, and interact with these rays (i.e., scintillation light) through the three-dimensional scintillator, and collect the information of this interaction through the sensor, and obtain the orientation information of the radiation source after data analysis, so that the 4π viewing angle radiation source rapid positioning device provided by the present application can have a 4π viewing angle to maintain excellent radiation source positioning performance in any direction, and can simultaneously meet good energy resolution and position resolution in wide viewing angle radioactivity detection, so as to quickly and accurately determine the location of the radiation source or the radiation hot zone in a nuclear terrorist incident, that is, it can simply, quickly, accurately and comprehensively determine the location of the radiation source.

[0010] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the embodiments of the present invention are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments of the present invention. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0012] Figure 1A schematic diagram of the structure of a 4π viewing angle radiation source rapid positioning device provided by an embodiment of the present invention;

[0013] Figure 2 A schematic diagram of the scintillation light collection process of the 4π viewing angle radiation source rapid positioning device provided by an embodiment of the present invention;

[0014] Figure 3 A schematic diagram of a flow chart of a method for quickly locating a radiation source at a 4π viewing angle provided by an embodiment of the present invention;

[0015] Figure 4 A functional module diagram of a data reading processing module provided by an embodiment of the present invention.

[0016] Reference numerals:

[0017] 100-4π viewing angle radiation source rapid positioning device; 110-spherical scintillator; 120-light sensor. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0019] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0021] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention may be combined with each other.

[0022] The embodiment of the present invention provides a technical solution, which includes a 4π viewing angle radiation source rapid positioning method, device and storage medium, and relates to the field of radiation detection. The technical solution provided by the present invention will be described below in conjunction with the accompanying drawings.

[0023] First, a 4π viewing angle radiation source rapid positioning device provided by an embodiment of the present invention is introduced, including a three-dimensional scintillator with a specific structure and a design of multiple light sensors. Specifically, the 4π viewing angle radiation source rapid positioning device may include: a three-dimensional scintillator, multiple light sensors, and a data reading and processing module. Among them, the multiple light sensors are dispersedly arranged on the surface of the three-dimensional scintillator. The multiple light sensors can also be connected to the data reading and processing module for communication.

[0024] Optionally, the shape of the three-dimensional scintillator includes a sphere, a spheroid or a columnar body, wherein the spheroid includes an ellipsoid, a spherical polyhedron or a Platonic regular polyhedron, and the columnar body includes a cylinder or a columnar polyhedron.

[0025] When the shape of the three-dimensional scintillator is a sphere (or a spherical body), the multiple light sensors can be closely spread over the surface of the sphere (that is, the multiple light sensors are spread over the sphere in a form of adjacent edges). When the shape of the three-dimensional scintillator is a column (taking a cylinder as an example), the multiple light sensors can be spread in a circle close to the side surface of the cylinder.

[0026] In an optional embodiment, the 4π viewing angle radiation source rapid positioning device further includes a light collecting material. The light collecting material is used to fill the gaps on the surface of the three-dimensional scintillator except for the plurality of light sensors. The light collecting material can be a material with strong light collecting performance, and the specific material type is not limited.

[0027] In the above embodiments, the optical sensor may be a device such as SiPM, MPPC, etc. that can convert a single photon signal into a photoelectric signal. In this embodiment, it may be SiPM. The optical sensor may fill the surface of the three-dimensional scintillator as much as possible.

[0028] The three-dimensional scintillator can be a module that converts gamma rays into multiple scintillation photons, and in this embodiment, it can be a CsI crystal.

[0029] under Figure 1 The 4π viewing angle radiation source rapid positioning device provided by the present invention is illustrated by taking the shape of the three-dimensional scintillator as a sphere as an example. It should be noted that the shape of the three-dimensional scintillator as a sphere is only an example, and does not mean that the shape of the three-dimensional scintillator in this scheme is limited to a sphere. On the basis of the present invention, the shape of the three-dimensional scintillator can be changed according to actual needs to achieve the purpose of the present invention. Therefore, based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work (for example, a 4π viewing angle radiation source rapid positioning device under the setting of the three-dimensional scintillator being a sphere, a spherical body or a columnar body, etc.) are all within the scope of protection of the present invention.

[0030] Please refer to Figure 1 , Figure 1The schematic diagram of the structure of a 4π viewing angle radiation source rapid positioning device provided by an embodiment of the present invention. The 4π viewing angle radiation source rapid positioning device 100 comprises: a spherical scintillator 110, a plurality of light sensors 120 and a data reading processing module (not shown in the figure). Each light sensor 120 comprises Figure 1 A dark block in the .

[0031] Please refer to Figure 1 , multiple light sensors 120 can be evenly coupled to the surface of the spherical scintillator, and the light sensors 120 can fill the entire surface of the spherical scintillator as much as possible, and the rest of the surface is filled with light collecting materials.

[0032] In an embodiment of the present application, when the radiation (γ) of the radiation source generates scintillation light in the spherical scintillator 110, the optical sensor is used to collect (or acquire) the optical signal corresponding to the scintillation light and convert it into an electrical signal (which can be understood as a photoelectric signal here), and the optical sensor can send the collected photoelectric signal to the data reading and processing module.

[0033] Understandable, please refer to Figure 2 , Figure 2 Schematic diagram of the scintillation light collection process of the 4π viewing angle radiation source rapid positioning device provided in an embodiment of the present invention. The scintillation light generated by the interaction of gamma rays in the spherical scintillator 110 can be regarded as a point because the area where the scintillation light is generated is negligible compared to the size of the scintillator. In the process of the scintillation light generated by a single gamma interaction propagating in the spherical scintillator 110, due to the propagation of light in the 4π direction and the attenuation of light during the propagation process, the closer the gamma ray interaction position is to the light sensor 120, the stronger the light intensity collected by the light sensor 120, and the larger the output photoelectric signal.

[0034] The data reading and processing module may be electrically connected to the plurality of light sensors 120. The data reading and processing module is used to control the plurality of light sensors 120 to implement the 4π viewing angle radiation source rapid positioning method described below.

[0035] Based on the above-mentioned 4π viewing angle radiation source rapid positioning device, the embodiment of the present invention provides a 4π viewing angle radiation source positioning algorithm, that is, a 4π viewing angle radiation source rapid positioning method, which can be applied to the above-mentioned 4π viewing angle radiation source rapid positioning device. The 4π viewing angle radiation source rapid positioning method can be executed by a data reading and processing module in the 4π viewing angle radiation source rapid positioning device to simply, quickly, accurately and comprehensively determine the location of the radiation source.

[0036] See also Figure 3 , Figure 3A schematic flow chart of a method for quickly locating a radiation source at a 4π viewing angle provided by an embodiment of the present invention. The method may include the following steps S110-S130. The following are described in sequence:

[0037] S110, continuously collecting multiple groups of photoelectric signals using multiple light sensors.

[0038] Each group of photoelectric signals includes multiple signal strength values, and one light sensor is used to collect one signal strength value in one collection process. That is to say, one light sensor obtains one signal strength value by collecting light in one interaction. Each group of photoelectric signals can represent the position information and intensity information of the scintillation light generated by the radiation of the radiation source in the scintillator.

[0039] In other words, during a single interaction between the radiation emitted by the radiation source and the scintillator, the scintillation light will propagate in the scintillator in the 4π direction. Therefore, during a single interaction, each of the multiple light sensors can collect a photoelectric signal that characterizes the strength of the received light signal. Therefore, in the process of executing the 4π viewing angle radiation source rapid positioning method, multiple light sensors can be controlled to collect data continuously for multiple times within a period of time. During each data collection process, all light sensors can collect data synchronously, thereby collecting multiple sets of continuous photoelectric signals. These multiple sets of photoelectric signals contain the distribution of the generation position of the scintillation light and the intensity information, the position of the radiation source (that is, the azimuth information of the radiation source), and the type information of the radiation source, so that the azimuth information of the radiation source can be solved based on these multiple sets of photoelectric signals. Among them, the azimuth information here can include the direction of the radiation source within the 4π field of view.

[0040] S120, determining the nuclide type of the radiation source according to the multiple groups of photoelectric signals.

[0041] Optionally, the nuclide type of the radiation source may be determined based on one or more sets of photoelectric signals.

[0042] In an optional embodiment, S120, determining the nuclide type of the radiation source according to the multiple groups of photoelectric signals may include the following steps 2.1 to 2.3:

[0043] Step 2.1, obtaining the total signal strength of one group of photoelectric signals among the multiple groups of photoelectric signals.

[0044] For example, a group of photoelectric signals may be randomly selected from multiple groups to calculate the total signal strength.

[0045] Step 2.2, using a digital multi-channel spectrometer to analyze multiple total signal intensities to obtain the energy spectrum of the radiation source.

[0046] Step 2.3, determine the nuclide type based on the energy spectrum.

[0047] Specifically, in the event of a single ray interaction generating scintillation light, the photoelectric signal intensities of multiple light sensors are summed to obtain the total signal intensity corresponding to the event. Due to the characteristics of the scintillator, the number of scintillation lights generated is proportional to the energy of the incident gamma photons and also proportional to the total signal intensity of the multiple light sensors. Therefore, a digital multi-channel spectrometer can be used to record and analyze multiple total signal intensities, and the nuclide identification method can be used to identify the type of nuclide of the radiation source in the resulting energy spectrum.

[0048] S130, determining the orientation information of the radiation source according to the nuclide type and the multiple groups of photoelectric signals.

[0049] Specifically, S130 may be implemented in the following two ways, namely, way 1 and way 2.

[0050] Method 1 may include the following steps:

[0051] Step 210: determine the direction of ray incidence according to the nuclide type and the intensity distribution of the multiple groups of photoelectric signals to determine the orientation information of the radiation source.

[0052] Specifically, step 210 may include the following steps:

[0053] 1. For the multiple groups of photoelectric signals collected, determine the cumulative photoelectric signal corresponding to each light sensor. The cumulative photoelectric signal includes the cumulative signal strength value. Specifically, multiple groups of photoelectric signals are collected within a preset time period, and for each light sensor, the photoelectric signals after multiple events are accumulated to obtain the cumulative photoelectric signal of each light sensor within the measurement time (corresponding to the preset time period);

[0054] 2. Determine the orientation information of the radiation source according to the type of nuclide and the distribution of the accumulated photoelectric signals corresponding to each photoelectric sensor. Specifically, for example, determine the maximum accumulated signal intensity value from the positions of multiple photoelectric sensors and the distribution of their accumulated signal intensity values, and determine the position corresponding to the maximum accumulated signal intensity value. Then, determine the orientation information of the radiation source according to the position corresponding to the maximum accumulated signal intensity value and the center position of the spherical scintillator 110.

[0055] There are many specific solution methods for determining the orientation information of the radiation source, such as determining the direction algorithm based on the maximum value, matching algorithm, maximum likelihood algorithm or solving through deep learning algorithm, which can be set according to actual application requirements and are not limited here.

[0056] For this method 1, the orientation of the radiation source can be solved without going through a position resolution scale, and better positioning accuracy can be achieved.

[0057] Method 2 may include the following steps:

[0058] Step 310 , determining the generating position of the flashing light corresponding to each group of photoelectric signals according to the multiple signal strength values ​​in each group of photoelectric signals and the positions of the multiple light sensors.

[0059] Step 320, determining the position information of the radiation source according to the generation positions of the scintillation lights corresponding to the multiple groups of photoelectric signals and the types of nuclides.

[0060] It should be understood that by dispersing multiple optical sensors on the surface of the three-dimensional scintillator, the 4π viewing angle radiation source rapid positioning device can sense the rays generated by the radiation source in various directions, and interact with these rays through the three-dimensional scintillator (that is, scintillation light), and collect the information of this interaction through the sensor, and obtain the orientation information of the radiation source after data analysis. In this way, the 4π viewing angle radiation source rapid positioning device provided by the present application has a 4π viewing angle to maintain excellent radiation source positioning performance in any direction, and can simultaneously meet good energy resolution and position resolution in wide-view radiation detection, thereby quickly and accurately determining the location of the radiation source or the radiation hot zone in a nuclear terrorist incident.

[0061] For method 2 in this application, better positioning accuracy can also be achieved.

[0062] In the above method embodiment, the shape of the three-dimensional scintillator can be a sphere, a spheroid or a column, etc., and there is no limitation on this. The following will be combined with a specific example (the shape of the three-dimensional scintillator is a sphere) to explain the above method embodiment in more detail. It can be understood that the execution principle of the following example can also be extended to the 4π viewing angle radiation source rapid positioning method under the condition that the shape of the three-dimensional scintillator is a column (such as a cylinder). In this case, it is also possible to locate the radiation source in the form of identifying the azimuth angle (360° viewing angle). Therefore, this simplified solution (the shape of the three-dimensional scintillator is a column) is also within the protection scope of this application.

[0063] The following will take the shape of a three-dimensional scintillator as an example of a sphere, and combine Figure 1 and Figure 2 The steps in the above method embodiment are described as follows:

[0064] In an optional embodiment, step 310, determining the generation position of the flashing light corresponding to each group of photoelectric signals according to the multiple signal strength values ​​in each group of photoelectric signals and the positions of the multiple light sensors, may include the following steps 1.1-1.2:

[0065] Step 1.1, for the i-th group of photoelectric signals among the multiple groups of photoelectric signals, obtain the maximum signal strength value and the corresponding signal strength value in the i-th group of photoelectric signals.

[0066] The maximum signal intensity value is collected by the first light sensor, and the corresponding signal intensity value is collected by the second light sensor, and the position of the second light sensor is symmetrical with the position of the first light sensor about the center of the three-dimensional scintillator.

[0067] Step 1.2, determining the generation position of the scintillation light corresponding to the i-th group of photoelectric signals according to the maximum signal intensity value, the corresponding signal intensity value, the position of the first light sensor and the diameter of the three-dimensional scintillator.

[0068] It can be understood that through the above steps 1.1 and 1.2, the generation positions (i.e., interaction positions) of multiple scintillation lights generated by the radiation source in the scintillator within a period of time can be determined, and the distribution and intensity information of the generation positions of these scintillation lights are related to the position of the radiation source (i.e., the orientation information of the radiation source).

[0069] Specifically, step 1.2, determining the generation position of the scintillation light corresponding to the i-th group of photoelectric signals according to the maximum signal intensity value, the corresponding signal intensity value, the position of the first light sensor and the diameter of the three-dimensional scintillator, may include the following steps 1.21-1.22:

[0070] Step 1.21, determining a first distance between a location where the flashing light corresponding to the i-th group of photoelectric signals is generated and a location of the first light sensor according to the following formula (1):

[0071] (1)

[0072] Wherein, d represents the first distance, D represents the diameter of the three-dimensional scintillator, L1 represents the maximum signal intensity value, and L2 represents the corresponding signal intensity value.

[0073] Step 1.22, determining the generating position of the flashing light corresponding to the i-th group of photoelectric signals according to the first distance and the position of the first light sensor.

[0074] Based on the above Figure 2 The principle of the scintillation light generated by the interaction of gamma rays in the spherical scintillator 110 described above, and the steps of determining the generation position of the scintillation light corresponding to the i-th group of photoelectric signals, please refer to Figure 2 :

[0075] 1. For multiple signal strength values ​​in the i-th group of photoelectric signals, a maximum signal strength value can be determined from the multiple signal strength values, and then the optical sensor corresponding to the maximum signal strength value is determined as the first optical sensor. For example, assuming Figure 2The light sensor A in the figure is the light sensor corresponding to the maximum signal strength value, and the position of the light sensor A is recorded as P1. The center of the spherical scintillator 110 is recorded as O. The light sensor B symmetrical to the light sensor A about the center O is the second light sensor. The signal strength value collected by the light sensor B is the corresponding signal strength value, and the position of the light sensor B is recorded as P2.

[0076] 2. The position of the flashing light corresponding to the i-th group of photoelectric signals (denoted as R (x, y, z)) is located at The signal strength value collected by the optical sensor A is L1, the signal strength value collected by the optical sensor B is L2, and D is the diameter of the spherical scintillator 110.

[0077] 3. Using the above formula , we can calculate the distance d between R(x, y, z) and P1. Then we can use d and P1 to express R(x, y, z).

[0078] In order to improve the accuracy of the position of the flash light corresponding to the i-th group of photoelectric signals, in step 1.1, the centers of the two light sensors with the second or third highest signal strength can be found near point P1, the standard deviation of the three light sensors can be calculated, and the three standard deviations can be compared. The light sensor with the smallest standard deviation is selected as the first light sensor, and then the .

[0079] Specifically, step 1.1, for the i-th group of photoelectric signals among the multiple groups of photoelectric signals, obtaining the maximum signal strength value and the corresponding signal strength value in the i-th group of photoelectric signals may include the following steps 1.11 to 1.16:

[0080] Step 1.11, obtaining N signal strength values ​​from the multiple signal strength values ​​of the i-th group of photoelectric signals.

[0081] Among them, the N signal strength values ​​are the first N values ​​with the highest strength values ​​among the multiple signal strength values ​​of the i-th group of photoelectric signals. In other words, the N signal strength values ​​are the first N values ​​of the multiple signal strength values ​​of the i-th group of photoelectric signals arranged in descending order of strength value. N can be, for example, 2, 3, 4, 5..., and there is no limitation on this.

[0082] Step 1.12, respectively calculate the precision coefficient corresponding to each signal strength value in the N signal strength values.

[0083] In this embodiment, the precision coefficient can be represented by the standard deviation σ. Specifically, the calculation process of the standard deviation includes:

[0084] Taking light sensor A as an example, first, find the The plane perpendicular to and passing through the center points of a circle of light sensors on the surface of the spherical scintillator 110 is used to calculate the standard deviation σ1 based on the signal intensity values ​​collected by this circle of light sensors. According to the symmetry of the sphere, the signal strength of this circle of light sensors is basically the same, so the standard deviation σ1 will be a smaller value accordingly. In other words, the smaller the standard deviation, the higher the accuracy of the data collected by the light sensor, and the higher the accuracy of the corresponding flash light generation position.

[0085] Step 1.13, determine the signal strength value with the highest precision coefficient among the N signal strength values ​​as the maximum signal strength value.

[0086] Taking standard deviation as an example, the smaller the standard deviation, the higher the coefficient of precision.

[0087] Step 1.14: determine the light sensor corresponding to the signal strength value with the highest accuracy coefficient as the first light sensor.

[0088] Step 1.15: determine a light sensor that is symmetrical with the first light sensor about the center of the three-dimensional scintillator as the second light sensor.

[0089] Step 1.16, determining the signal strength value collected by the second light sensor as the corresponding signal strength value.

[0090] Optionally, the above steps 1.21 and 1.22 may also be replaced by methods such as "layered comparison" to calculate the generation position of the flashing light corresponding to the i-th group of photoelectric signals.

[0091] In an optional embodiment, step 320, determining the orientation information of the radiation source based on the generation positions and nuclide types of the scintillation lights corresponding to the multiple groups of photoelectric signals, may include step 3.1: using a maximum likelihood analysis method or a trained neural network model (referred to as a radiation source positioning model) to analyze the generation positions and nuclide types of the scintillation lights corresponding to the multiple groups of photoelectric signals to obtain the orientation information of the radiation source.

[0092] Specifically, a radiation source positioning model can be trained using experimental data, deep learning frameworks, and artificial neural network models. The radiation source positioning model is integrated into the system of a 4π-viewing angle radiation source rapid positioning device, so that the device can use the generation positions of the flashing lights corresponding to multiple sets of photoelectric signals and the types of nuclides to infer the radiation source position in real time when detecting the radiation source.

[0093] The specific process may include the following:

[0094] 1. Collect experimental data sets related to the location of radioactive sources, such as light sensor readings, radioactive source locations, nuclide types, and nuclide energies.

[0095] 2. Preprocess the experimental dataset for training.

[0096] 3. Use the preprocessed experimental data set, deep learning framework and artificial neural network model to train the radiation source positioning model. The data set can be divided into training set, validation set and test set, and the training set is used to optimize the model parameters.

[0097] 4. Deploy the trained radiation source localization model to the radiation source localization model system to ensure that the model can process input data in real time and output accurate radiation source locations.

[0098] It should be noted that in the method provided in the above embodiment, a scintillator rich in hydrogen atoms can be selected to detect fast neutrons, and through pulse discrimination, gamma and neutron signals can be separated and located, thereby locating the neutron source.

[0099] In the method provided in the above embodiment, in S130, after determining the orientation information of the radiation source according to the nuclide type and the multiple groups of photoelectric signals, multiple 4π viewing angle radiation source rapid positioning devices 100 can be dispersedly arranged. For one radiation source, after each 4π viewing angle radiation source rapid positioning device 100 calculates its own orientation information relative to the radiation source, the position information of the radiation source can be solved through the geometric position.

[0100] According to the above method embodiments, the present application can have the following beneficial effects:

[0101] 1. This application is suitable for use in places where radioactive materials are prone to leak, such as radioactive treatment hospitals, nuclear power plants, and radioactive laboratories.

[0102] 2. This application is suitable for achieving high-precision positioning of radiation sources within a 4π viewing angle.

[0103] 3. In the present application, the outside of the spherical scintillator is filled with light sensors as much as possible, and the light sensors themselves do not block gamma rays too much, and can locate gamma radiation sources with energies between 30keV and 3000keV.

[0104] 4. Based on the structure of the radiation source orientation device of the present application solution, by adding data processing, a device that integrates nuclide identification, dose rate measurement, and radiation source positioning can be realized.

[0105] In order to execute the corresponding steps in the above embodiments and various possible methods, the following is a method for implementing the data reading and processing module in the 4π viewing angle radiation source rapid positioning device 100, please refer to Figure 4 , Figure 4The functional module diagram of a data reading processing module 300 provided in an embodiment of the present invention is shown. The data reading processing module 300 can be used to implement the above Figure 3 It should be noted that the basic principle and technical effect of the data reading processing module 300 provided in this embodiment are the same as those of the above embodiment. For the sake of brief description, for the parts not mentioned in this embodiment, reference can be made to the corresponding contents in the above embodiment. The data reading processing module 300 may include: a transceiver unit 310 and a processing unit 320.

[0106] Optionally, the transceiver unit 310 and the processing unit 320 may be stored in a memory in the form of software or firmware or solidified in the memory provided by the present invention. Figure 1 The data reading and processing module 300 of the radiation source orientation device 100 shown in the figure is in the operating system (OS) and can be executed by the data reading and processing module 300. Meanwhile, the data and program codes required to execute the above units can be stored in the memory.

[0107] It is understandable that the transceiver unit 310 and the processing unit 320 can be used to support the data reading processing module 300 to perform the relevant steps in the above method embodiment, and / or other processes of the technology described herein, such as the above Figure 3 The method embodiments shown and the various method embodiments described above are not limited to this.

[0108] Based on the above method embodiment, the embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the above method embodiment is executed. Specifically, the storage medium can be a general storage medium, such as a mobile disk, a hard disk, etc. When the computer program on the storage medium is executed, the method in the above embodiment can be executed.

[0109] The above description is only an embodiment of the present invention and is not intended to limit the protection scope of the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for quickly locating a radiation source at a 4π viewing angle, characterized in that: The invention is applied to a 4π viewing angle radiation source rapid positioning device, the 4π viewing angle radiation source rapid positioning device comprises a three-dimensional scintillator and a plurality of light sensors, the plurality of light sensors are dispersedly arranged on the surface of the three-dimensional scintillator; when the radiation of the radiation source generates scintillation light by interaction in the three-dimensional scintillator, the light sensor is used to collect the photoelectric signal corresponding to the scintillation light, the shape of the three-dimensional scintillator comprises a sphere, a spheroid or a columnar body; wherein the spheroid comprises an ellipsoid or a Platonic regular polyhedron, and the columnar body comprises a cylinder or a columnar polyhedron; Wherein, the 4π viewing angle radiation source rapid positioning method comprises: Utilizing the plurality of optical sensors to continuously collect a plurality of groups of photoelectric signals; wherein each group of photoelectric signals includes a plurality of signal strength values, and one optical sensor obtains one signal strength value by collecting light in one interaction; Determining the nuclide type of the radiation source according to the multiple groups of photoelectric signals; Determining the direction of ray incidence according to the nuclide type and the intensity distribution of the multiple groups of photoelectric signals to determine the orientation information of the radiation source; Alternatively, the generation position of the scintillation light corresponding to each group of photoelectric signals is determined based on multiple signal strength values ​​in each group of photoelectric signals and the positions of the multiple optical sensors, and the orientation information of the radiation source is determined based on the distribution of the generation positions of the scintillation light corresponding to the multiple groups of photoelectric signals and the nuclide type.

2. The 4π viewing angle radiation source rapid positioning method according to claim 1, characterized in that: When the shape of the three-dimensional scintillator includes a sphere or a spheroid, determining the generation position of the scintillation light corresponding to each group of photoelectric signals according to multiple signal intensity values ​​in each group of photoelectric signals and the positions of the multiple light sensors comprises the following steps: For an i-th group of photoelectric signals among the multiple groups of photoelectric signals, a maximum signal intensity value and a corresponding signal intensity value in the i-th group of photoelectric signals are obtained; wherein the maximum signal intensity value is collected by a first light sensor, and the corresponding signal intensity value is collected by a second light sensor, and a position of the second light sensor is symmetrical to a position of the first light sensor with respect to the three-dimensional scintillator; The generation position of the scintillation light corresponding to the i-th group of photoelectric signals is determined according to the maximum signal strength value, the corresponding signal strength value, the position of the first light sensor and the diameter of the three-dimensional scintillator.

3. The 4π viewing angle radiation source rapid positioning method according to claim 2, characterized in that: Determining the generation position of the scintillation light corresponding to the i-th group of photoelectric signals according to the maximum signal strength value, the corresponding signal strength value, the position of the first light sensor and the diameter of the three-dimensional scintillator comprises the following steps: The first distance between the generating position of the flashing light corresponding to the i-th group of photoelectric signals and the position of the first light sensor is determined according to the following formula: ； Wherein, d represents the first distance, D represents the diameter of the three-dimensional scintillator, L1 represents the maximum signal intensity value, and L2 represents the corresponding signal intensity value; The generating position of the flashing light corresponding to the i-th group of photoelectric signals is determined according to the first distance and the position of the first light sensor.

4. The 4π viewing angle radiation source rapid positioning method according to claim 2, characterized in that: For an i-th group of photoelectric signals among the multiple groups of photoelectric signals, obtaining a maximum signal strength value and a corresponding signal strength value in the i-th group of photoelectric signals comprises the following steps: Obtaining N signal strength values ​​from among the multiple signal strength values ​​of the i-th group of photoelectric signals; wherein the N signal strength values ​​are the first N values ​​with the highest strength values ​​from among the multiple signal strength values ​​of the i-th group of photoelectric signals; Calculate the accuracy coefficient corresponding to each signal strength value in the N signal strength values ​​respectively; Determine the signal strength value with the highest precision coefficient among the N signal strength values ​​as the maximum signal strength value; Determine the light sensor corresponding to the signal strength value with the highest accuracy coefficient as the first light sensor; determining a light sensor symmetrical to the first light sensor in position with respect to the three-dimensional scintillator as the second light sensor; The signal strength value collected by the second light sensor is determined as the corresponding signal strength value.

5. The 4π viewing angle radiation source rapid positioning method according to any one of claims 1 to 4, characterized in that: The 4π viewing angle radiation source rapid positioning device further comprises a light collecting material, and the light collecting material is used to fill the gaps on the surface of the three-dimensional scintillator except for the plurality of light sensors.

6. The method for quickly locating a radiation source at a 4π viewing angle according to any one of claims 1 to 4, characterized in that: Determining the nuclide type of the radiation source according to the multiple groups of photoelectric signals includes the following steps: Obtaining the total signal strength of one group of photoelectric signals from the multiple groups of photoelectric signals; The energy spectrum of the radiation source is obtained by analyzing the intensities of multiple total signals using a digital multi-channel spectrometer; The nuclide type is determined based on the energy spectrum.

7. The method for quickly locating a radiation source at a 4π viewing angle according to any one of claims 1 to 4, characterized in that: The method comprises the following steps: determining the position information of the radiation source according to the generation position distribution of the scintillation light corresponding to the multiple groups of photoelectric signals and the type of the nuclide: The generation positions of the scintillation lights corresponding to the multiple groups of photoelectric signals and the types of nuclides are analyzed using a maximum likelihood method or a trained neural network model to obtain the orientation information of the radiation source.

8. A 4π viewing angle radiation source rapid positioning device, characterized in that: include: A three-dimensional scintillator, a plurality of optical sensors and a data reading and processing module, wherein the plurality of optical sensors are dispersedly arranged on the surface of the three-dimensional scintillator; When the radiation emitted by the radiation source generates scintillation light in the three-dimensional scintillator, the optical sensor is used to collect a photoelectric signal corresponding to the scintillation light; The data reading and processing module is used to control the multiple optical sensors to implement the 4π viewing angle radiation source rapid positioning method as described in any one of claims 1 to 7.

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