Method and device for realizing incident neutron positioning by neutron detector, computing equipment and storage medium

Abstract

The invention discloses a method and device for positioning incident neutrons through a neutron detector, computing equipment and a storage medium, and the method comprises the steps: carrying out the boron film plating treatment on the surface of a scintillation crystal of the neutron detector, and obtaining the neutron detector of a boron-coated scintillation crystal with a boron film; after the neutron detector of the boron-coated scintillation crystal with the boron-plated film is obtained, collecting pulse waveform data of each channel of the neutron detector according to a trigger signal generated by each event, and calculating a charge ratio of the pulse waveform data of each channel of each event by adopting a charge integration method; judging whether each event is a neutron event or a gamma event according to the charge ratio of the pulse waveform data of each channel of each event; and when the event is judged to be a neutron event, calculating the incident position of neutrons when the neutron event occurs by adopting a photon response function two-dimensional Gaussian distribution method.

Description

Technical Field

[0001] The present invention relates to the field of radiation detection technology, and in particular to a method, device, computing equipment and storage medium for realizing incident neutron positioning by a neutron detector. Background Art

[0002] In recent years, neutron detection technology has rapidly developed in fields such as high-intensity neutron sources, material structure, nanoscience, condensed matter physics, and space physics. It also plays a vital role in industries such as nuclear medicine and radiotherapy, aerospace and industrial applications, nuclear power plant safety monitoring systems, environmental monitoring systems, and the detection of nuclear explosions and hidden nuclear materials. These detectors typically offer advantages such as high count rates, high detection efficiency, high position resolution, and a high neutron / gamma suppression ratio.

[0003] Tradition 3 He gas neutron detector is the most commonly used and mature neutron detection method. 3 He is not solid and is not easy to seal under normal circumstances. Its supply is also restricted by the United States and is very expensive. Therefore, it is urgent to develop other types of neutron detectors to replace traditional ones. 3 He neutron detectors. Currently can replace 3 Scintillator detectors are primarily used for He neutron detection. Scintillator detectors offer advantages such as low cost, high detection efficiency, simple structure, and stable performance, and have been widely researched and applied in neutron detection. Scintillator neutron detectors primarily utilize the nuclear reaction method, indirectly measuring neutrons by generating charged particles through the interaction of neutrons with neutron-sensitive materials. These charged particles then produce fluorescence within the scintillator.

[0004] In recent years, GAGG (Gallium Germanium Arsenide Gallium) scintillator crystals have become a popular material for neutron detectors due to their high neutron reaction cross section, high light yield, short luminescence decay time, resistance to deliquesce, high density, and high energy resolution. Traditional methods directly use GAGG crystals for neutron detection. However, due to the significant gamma-ray background associated with neutron measurements, GAGG crystals are also sensitive to gamma rays, making neutron / gamma discrimination difficult and resulting in relatively low neutron detection efficiency. Summary of the Invention

[0005] The present invention provides a method, device, computing equipment and storage medium for realizing incident neutron positioning by a neutron detector, so as to solve the technical problems of how to realize neutron / gamma discrimination and how to improve the detection efficiency of neutrons.

[0006] An embodiment of the present invention provides a method for implementing incident neutron positioning using a neutron detector, comprising:

[0007] A neutron detector having a boron-coated scintillation crystal is obtained by performing a boron coating treatment on the surface of the scintillation crystal of the neutron detector;

[0008] After obtaining a neutron detector having a boron-coated scintillating crystal with a boron film, pulse waveform data of each channel of the neutron detector is collected according to the trigger signal generated by each event, and the charge ratio of the pulse waveform data of each channel of each event is calculated using a charge integration method;

[0009] Determining whether each event is a neutron event or a gamma event by using the charge ratio of the pulse waveform data of each channel of each event;

[0010] When determining that an event is a neutron event, a two-dimensional Gaussian distribution method of a photon response function is used to calculate the incident position of the neutron when the neutron event occurs.

[0011] Preferably, the method of performing boron coating on the surface of the scintillation crystal of the neutron detector to obtain a neutron detector having a boron-coated scintillation crystal with a boron-coated film comprises:

[0012] Performing boron coating on the surface of the scintillation crystal by electrostatic spraying to form a neutron detector having a boron coating on the scintillation crystal; or

[0013] Boron carbide B4C or boron oxide B2O3 thin film is deposited on the surface of scintillation crystal by DC magnetron sputtering to obtain a neutron detector with boron-coated scintillation crystal.

[0014] Preferably, the collecting of the pulse waveform data of each channel of the neutron detector according to the trigger signal generated by each event and calculating the charge ratio of the pulse waveform data of each channel of each event by using the charge integration method includes:

[0015] Collect pulse waveform data of each channel of the neutron detector according to the trigger signal generated by each event, and calculate the total pulse waveform data of each event;

[0016] The sum pulse waveform data of each event is segmented to obtain two segments of sum pulse waveform data, and the charge amount of each segment of the sum pulse waveform data is calculated using a charge integration method;

[0017] According to the charge amount of each segment of the total pulse waveform data, the charge ratio of the pulse waveform data of each channel of each event is obtained.

[0018] Preferably, the determining whether each event is a neutron event or a gamma event by using the charge ratio of the pulse waveform data of each channel of each event includes:

[0019] By performing statistical processing on the charge ratios of the pulse waveform data of each channel of each event, a charge ratio distribution diagram of all events is formed;

[0020] According to the charge ratio distribution diagram of all events, a charge ratio threshold for determining neutron events and gamma events is determined, and each event is determined to be a neutron event or a gamma event according to the charge ratio threshold.

[0021] Preferably, determining whether each event is a neutron event or a gamma event according to the charge ratio threshold value includes:

[0022] If the charge ratio of the pulse waveform data of each channel of the event is greater than the charge ratio threshold, the event is determined to be a neutron event;

[0023] If the charge ratio of the pulse waveform data of each channel of the event is not greater than the charge ratio threshold, the event is determined to be a gamma event.

[0024] Preferably, the calculating the incident position of the neutron when the neutron event occurs by using a two-dimensional Gaussian distribution method of a photon response function comprises:

[0025] According to the photon intensity generated by the nuclear reaction of neutrons at the neutron incident position, a Gaussian distribution expression of the two-dimensional photon intensity is constructed;

[0026] By performing a series of matrix transformations and matrix decomposition processes on the Gaussian distribution expression of the two-dimensional photon intensity, the incident position of the neutron when the neutron event occurs is obtained.

[0027] Preferably, the Gaussian distribution expression of the two-dimensional photon intensity includes:

[0028]

[0029] Among them, Q xi,yi are the photon intensities collected by the silicon photomultiplier SiPM in the i-th row and i-th column respectively; σ x and σ y are the photon distribution broadening in the x and y directions respectively; Q b is the background photon intensity and noise; x i and y i are the row and column positions of each SiPM pixel respectively; x0 and y0 are the row and column positions of the actual incident neutron respectively; A is the actual luminous intensity.

[0030] An embodiment of the present invention further provides a device for a neutron detector to realize incident neutron positioning, comprising:

[0031] A boron coating processing module is used to perform boron coating on the surface of the scintillation crystal of the neutron detector to obtain a neutron detector having a boron-coated scintillation crystal;

[0032] A neutron determination module is configured to, after obtaining a neutron detector having a boron-coated scintillating crystal with a boron film, collect pulse waveform data of each channel of the neutron detector according to a trigger signal generated by each event, and calculate a charge ratio of the pulse waveform data of each channel for each event using a charge integration method; and determine whether each event is a neutron event or a gamma event using the charge ratio of the pulse waveform data of each channel for each event;

[0033] The neutron positioning module is used to calculate the incident position of the neutron when the neutron event occurs by using the two-dimensional Gaussian distribution method of the photon response function when the event is determined to be a neutron event.

[0034] An embodiment of the present invention further provides a computing device, including:

[0035] memory and processor;

[0036] The memory is used to store computer-executable instructions, and the processor is used to execute the computer-executable instructions. When the computer-executable instructions are executed by the processor, the steps of the method for the neutron detector to realize incident neutron positioning are implemented.

[0037] An embodiment of the present invention further provides a computer-readable storage medium storing computer-executable instructions. When the computer-executable instructions are executed by a processor, the steps of the method for implementing incident neutron positioning by the neutron detector are implemented.

[0038] The beneficial effects of the present invention are as follows: by performing a boron coating treatment on the surface of a scintillation crystal of a neutron detector, a neutron detector having a boron-coated scintillation crystal with a boron coating is obtained; after obtaining the neutron detector having a boron-coated scintillation crystal with a boron coating, pulse waveform data of each channel of the neutron detector is collected according to the trigger signal generated by each event, and the charge ratio of the pulse waveform data of each channel of each event is calculated using a charge integration method; using the charge ratio of the pulse waveform data of each channel of each event, each event is determined to be a neutron event or a gamma event; when the event is determined to be a neutron event, the photon response function two-dimensional Gaussian distribution method is used to calculate the incident position of the neutron when the neutron event occurs. The present invention provides a method for realizing incident neutron positioning, which can simultaneously achieve high neutron-gamma discrimination capability, high detection efficiency and position resolution, while reducing the cost of the neutron detector. In addition, a scintillator neutron detector with a boron film coated on the surface of a GAGG scintillation crystal is provided. On the one hand, the neutron detection efficiency is improved by the high energy released by the nuclear reaction between neutrons and boron; on the other hand, the alpha particles produced in the nuclear reaction can be easily distinguished by the pulse shape, thereby achieving neutron / gamma discrimination. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 This is a flow chart of a method for implementing incident neutron positioning using a neutron detector provided by the present invention;

[0040] Figure 2 This is a schematic diagram of a neutron detector provided by the present invention for realizing incident neutron positioning;

[0041] Figure 3 is a schematic diagram of the neutron detector structure provided by the present invention;

[0042] Figure 4 is a schematic diagram of a charge ratio distribution diagram provided by the present invention;

[0043] Figure 5 This is a structural block diagram of a computing device provided by the present invention. DETAILED DESCRIPTION

[0044] It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. In the subsequent description, suffixes such as "module," "component," or "unit" used to denote components are used solely to facilitate the description of the present invention and have no inherent meaning. Therefore, "module," "component," or "unit" may be used interchangeably.

[0045] The present invention is based on the neutron detector method of reading out boron-coated GAGG crystals (continuous crystals or crystal arrays) using SiPM (Silicon Photomultiplier). 10 A B4C film is deposited on the surface or side of a GAGG crystal, with a thickness of approximately 1 mm (not specifically limited). A new generation silicon photomultiplier (SiPM) array is used as the photoelectric converter. A light guide can be added between the crystal and the SiPM. The crystal, light guide, and SiPM array are coupled via silicone oil. The present invention employs an innovative photon response function method to calculate neutron incidence location and implements neutron gamma discrimination via a charge integration method. The neutron detector provided by the embodiments of the present invention achieves high detection efficiency, a high neutron gamma discrimination ratio, and high position resolution at a low cost.

[0046] GAGG crystal is a cerium-doped gadolinium aluminum gallium garnet crystal with the characteristics of high light output, fast attenuation, high energy resolution and high density. It is widely used in high-energy physics, nuclear medicine imaging and ionizing radiation detection in industry.

[0047] Figure 1 This is a flow chart of a method for realizing incident neutron positioning by a neutron detector provided by the present invention. Figure 1 Shown, including:

[0048] Step S101: performing a boron coating process on the surface of the scintillation crystal of the neutron detector to obtain a neutron detector having a boron-coated scintillation crystal;

[0049] In an embodiment of the present invention, the neutron detector comprising a boron-coated scintillation crystal having a boron-coated film is obtained by performing a boron coating process on the surface of the scintillation crystal of the neutron detector, comprising:

[0050] Performing boron coating on the surface of the scintillation crystal by electrostatic spraying to form a neutron detector having a boron coating on the scintillation crystal; or

[0051] Boron carbide B4C or boron oxide B2O3 thin film is deposited on the surface of scintillation crystal by DC magnetron sputtering to obtain a neutron detector with boron-coated scintillation crystal.

[0052] A neutron detector system in an embodiment of the present invention includes a trigger signal module, a sampling module, and a processing module. The trigger signal module generates a trigger signal, the sampling module collects pulse waveform data from each channel of the neutron detector based on the trigger signal, and the processing module executes a method for locating incident neutrons using the neutron detector. The trigger signal module determines whether to generate a trigger signal based on characteristic signals output by the neutron detector, such as the summed signal from each channel or the dynode signal output by the light detector.

[0053] like Figure 3 As shown in FIG, the neutron detector structure includes a scintillation crystal, a boron-coated film, a light detector, and a light guide. The scintillation crystal is subjected to a boron-coated film treatment: specifically, a boron coating is formed on the surface of the scintillation crystal by an electrostatic spraying process, or a 1 μm thick B4C or B2O3 film is deposited on the surface of the crystal by DC magnetron sputtering, as shown in FIG. Figure 3 shown.

[0054] In an embodiment of the present invention, when the dynode signal of the light detector exceeds a set threshold, a square wave signal is generated, which is used as a trigger signal for neutron detector collection. The first falling edge or rising edge of the trigger signal is used as the starting time for counting the number of pulses, and waveform sampling data of each channel of the neutron detector is collected, so that the waveform sampling data includes a statistical period.

[0055] In an embodiment of the present invention, the boron-containing film includes but is not limited to: boron oxide (B2O3), boron carbide (B4C), etc.; the photodetector array can be replaced by: position sensitive photomultiplier tubes (PSPMT), microchannel plates (MCP), avalanche photodiode (APD) arrays, silicon photomultiplier tubes (SiPM), multi-pixel photon counters (MPPC), photomultiplier tubes (PMT); coupling materials include but are not limited to: reflective film, air and optical glue; scintillating crystals include but are not limited to: GAGG, GS20, etc.

[0056] Step S102: After obtaining a neutron detector having a boron-coated scintillating crystal with a boron film, pulse waveform data of each channel of the neutron detector is collected according to the trigger signal generated by each event, and a charge integration method is used to calculate the charge ratio of the pulse waveform data of each channel for each event;

[0057] In an embodiment of the present invention, the step of collecting pulse waveform data of each channel of the neutron detector according to the trigger signal generated by each event and calculating the charge ratio of the pulse waveform data of each channel of each event using the charge integration method includes:

[0058] Collect pulse waveform data of each channel of the neutron detector according to the trigger signal generated by each event, and calculate the total pulse waveform data of each event;

[0059] The sum pulse waveform data of each event is segmented to obtain two segments of sum pulse waveform data, and the charge amount of each segment of the sum pulse waveform data is calculated using a charge integration method;

[0060] According to the charge amount of each segment of the total pulse waveform data, the charge ratio of the pulse waveform data of each channel of each event is obtained.

[0061] Step S103: using the charge ratio of the pulse waveform data of each channel of each event, determining whether each event is a neutron event or a gamma event;

[0062] In an embodiment of the present invention, determining whether each event is a neutron event or a gamma event by using the charge ratio of the pulse waveform data of each channel of each event includes:

[0063] By performing statistical processing on the charge ratios of the pulse waveform data of each channel of each event, a charge ratio distribution diagram of all events is formed;

[0064] According to the charge ratio distribution diagram of all events, a charge ratio threshold for determining neutron events and gamma events is determined, and each event is determined to be a neutron event or a gamma event according to the charge ratio threshold.

[0065] That is, the neutron-gamma discrimination method in the embodiment of the present invention mainly utilizes pulse shape to achieve neutron-gamma discrimination. Neutron-gamma discrimination is achieved by using the charge integration method, which specifically includes:

[0066] 1) First, obtain the sum pulse signal of each event, then divide the sum pulse signal into two segments, and use the charge integration method to calculate the charge ratio of the two integration intervals;

[0067] Among them, the charge ratio of the two integral intervals (R = I t2 / (I t1 +I t2 )), where R is the charge ratio; I t1 The charge value is obtained by integrating the pulse amplitude over time from the pulse starting point to time t1; I t2 The charge value is obtained by integrating the pulse amplitude over time from pulse t1 to the end of the pulse.

[0068] 2) Count the charge ratios of all events and obtain the charge ratio distribution diagram of all events, such as Figure 4 shown.

[0069] 3) Identify neutron and gamma events based on the charge ratio distribution of all events.

[0070] like Figure 4 As shown, the red vertical line is the charge ratio threshold n. The judgment on the left side of the red vertical line is a gamma event, and the judgment on the right side of the red vertical line is a neutron event.

[0071] In an embodiment of the present invention, determining whether each event is a neutron event or a gamma event based on the charge ratio threshold includes: if the charge ratio of the pulse waveform data of each channel of the event is greater than the charge ratio threshold, determining that the event is a neutron event; if the charge ratio of the pulse waveform data of each channel of the event is not greater than the charge ratio threshold, determining that the event is a gamma event.

[0072] Step S104: When the event is determined to be a neutron event, a two-dimensional Gaussian distribution method of a photon response function is used to calculate the incident position of the neutron when the neutron event occurs.

[0073] In an embodiment of the present invention, the calculation of the incident position of the neutron when the neutron event occurs by using a two-dimensional Gaussian distribution method of a photon response function includes:

[0074] According to the photon intensity generated by the nuclear reaction of neutrons at the neutron incident position, a Gaussian distribution expression of the two-dimensional photon intensity is constructed;

[0075] By performing a series of matrix transformations and matrix decomposition processes on the Gaussian distribution expression of the two-dimensional photon intensity, the incident position of the neutron when the neutron event occurs is obtained.

[0076] In an embodiment of the present invention, the Gaussian distribution expression of the two-dimensional photon intensity includes:

[0077]

[0078] Among them, Q xi,yi are the photon intensities collected by the silicon photomultiplier SiPM in the i-th row and i-th column respectively; σ x and σ y are the photon distribution broadening in the x and y directions respectively; Q b is the background photon intensity and noise; x i and y i are the row and column positions of each SiPM pixel respectively; x0 and y0 are the row and column positions of the actual incident neutron respectively; A is the actual luminous intensity.

[0079] The incident neutron positioning method specifically includes:

[0080] The X and Y direction positions are estimated using the two-dimensional Gaussian distribution method of the photon response function. First, the photon intensity Q generated by the nuclear reaction of the neutron at the position (x0, y0) is calculated. xi,yi , modeled as a two-dimensional Gaussian distribution (i.e., the Gaussian distribution expression of the two-dimensional photon intensity) Then, by calculating the row and column position (x i ,y i ) and performing the above Gaussian fitting on the number of photons collected at . The true location of the neutron event can be obtained. Finally, through a series of matrix transformations and solutions, the true location of the neutron event (x0, y0) is obtained.

[0081] Where Q xi,yi are the intensity information related to the number of photons collected by the SiPM in the i-th row and the i-th column (i.e., photon intensity); σ x and σ y are the photon distribution broadening in the x and y directions respectively; Q b is the background photon intensity and noise. In practice, σ x =σ yThe photon distribution is broadened and kept at a fixed value, which can reduce the standard deviation of the neutron position (x0, y0) and the true luminous intensity A.

[0082] In an embodiment of the present invention, by performing a series of matrix transformations and matrix decomposition processes on the Gaussian distribution expression of the two-dimensional photon intensity, the incident position of the neutron when the neutron event occurs is obtained, which includes:

[0083] 11) By taking the logarithm of both sides of the equation for the Gaussian distribution expression of the two-dimensional photon intensity, the first expression is obtained:

[0084] Taking the logarithm of both sides of the equation, we get the first expression:

[0085]

[0086] Among them, the definition is:

[0087] Where r represents the conversion parameter.

[0088] 12) Perform matrix transformation on the first expression to obtain the first matrix expression:

[0089]

[0090] Among them, the definition is:

[0091]

[0092]

[0093] Among them, B, α, Λ, e, α i , b, Indicates the conversion parameters.

[0094] 13) Solve the first matrix expression to obtain the incident position of the neutron:

[0095]

[0096] Among them, the definition is:

[0097] Where Q represents the transformation matrix parameter.

[0098] In an embodiment of the present invention, a neutron detector comprising a boron-coated scintillation crystal is obtained by coating the surface of a neutron detector with a boron film. After obtaining the boron-coated scintillation crystal, pulse waveform data from each channel of the neutron detector is collected based on the trigger signal generated by each event, and the charge ratio of the pulse waveform data for each channel of each event is calculated using a charge integration method. The charge ratio of the pulse waveform data for each channel of each event is used to determine whether each event is a neutron event or a gamma event. When the event is determined to be a neutron event, the incident position of the neutron at the time of the neutron event is calculated using a two-dimensional Gaussian distribution method of a photon response function. The present invention provides a method for localizing incident neutrons, which can simultaneously achieve high neutron-gamma discrimination capability, high detection efficiency, and position resolution, while reducing the cost of the neutron detector. Furthermore, a scintillator neutron detector comprising a boron-coated scintillation crystal is provided. Neutron detection efficiency is improved by utilizing the high energy released by the nuclear reaction between neutrons and boron. Furthermore, alpha particles produced in the nuclear reaction are easily distinguished by their pulse shape, thereby achieving neutron / gamma discrimination.

[0099] Figure 2 FIG. 1 is a schematic diagram of a neutron detector provided by the present invention for realizing incident neutron positioning. Figure 2 Shown, including:

[0100] A boron coating film processing module is used to obtain a boron-coated scintillation crystal having a boron coating film by performing a boron coating process on the surface of the scintillation crystal;

[0101] A neutron determination module is configured to, after obtaining a boron-coated scintillating crystal having a boron coating, collect pulse waveform data of each channel of the neutron detector according to a trigger signal generated by each event, and calculate a charge ratio of the pulse waveform data of each channel for each event using a charge integration method; and determine whether each event is a neutron event or a gamma event using the charge ratio of the pulse waveform data of each channel for each event;

[0102] The neutron positioning module is used to calculate the incident position of the neutron when the neutron event occurs by using the two-dimensional Gaussian distribution method of the photon response function when the event is determined to be a neutron event.

[0103] The above is a schematic diagram of a device for locating incident neutrons using a neutron detector according to this embodiment. It should be noted that the technical solution of the device for locating incident neutrons using a neutron detector is based on the same concept as the technical solution of the method for locating incident neutrons using a neutron detector described above. For details not described in detail in the technical solution of the device for locating incident neutrons using a neutron detector, please refer to the description of the technical solution of the method for locating incident neutrons using a neutron detector described above.

[0104] Figure 54 is a block diagram of a computing device provided by the present invention. The components of the computing device 400 include, but are not limited to, a memory 410 and a processor 420. The processor 420 is connected to the memory 410 via a bus 430, and a database 450 is used to store data.

[0105] The computing device 400 also includes an access device 440 that enables the computing device 400 to communicate via one or more networks 460. Examples of these networks include a public switched telephone network (PSTN), a local area network (LAN), a wide area network (WAN), a personal area network (PAN), or a combination of communication networks such as the Internet. The access device 440 may include one or more of any type of network interface (e.g., a network interface card (NIC)) whether wired or wireless, such as an IEEE 802.11 wireless local area network (WLAN) wireless interface, a Worldwide Interoperability for Microwave Access (Wi-MAX) interface, an Ethernet interface, a universal serial bus (USB) interface, a cellular network interface, a Bluetooth interface, a near field communication (NFC) interface, and the like.

[0106] In one embodiment of the present specification, the above components of the computing device 400 and Figure 5 Other components not shown in the figure may also be connected to each other, for example, via a bus. Figure 5 The computing device structure block diagram shown is for illustrative purposes only and is not intended to limit the scope of this specification. Those skilled in the art may add or replace other components as needed.

[0107] Computing device 400 can be any type of stationary or mobile computing device, including a mobile computer or mobile computing device (e.g., a tablet computer, a personal digital assistant, a laptop computer, a notebook computer, a netbook computer, etc.), a mobile phone (e.g., a smartphone), a wearable computing device (e.g., a smartwatch, smart glasses, etc.), or other types of mobile devices, or a stationary computing device such as a desktop computer or PC. Computing device 400 can also be a mobile or stationary server.

[0108] The processor 420 is configured to execute the following computer executable instructions, which, when executed by the processor, implement the steps of the above-mentioned method for implementing incident neutron positioning by a neutron detector.

[0109] The above is a schematic diagram of a computing device according to this embodiment. It should be noted that the technical solution of this computing device and the technical solution of the aforementioned method for implementing incident neutron location with a neutron detector share the same concept. For details not described in detail in the technical solution of the computing device, please refer to the description of the technical solution of the aforementioned method for implementing incident neutron location with a neutron detector.

[0110] An embodiment of the present invention further provides a computer-readable storage medium storing computer-executable instructions. When the computer-executable instructions are executed by a processor, the steps of the method for implementing incident neutron positioning by the neutron detector are implemented.

[0111] The above is a schematic diagram of a computer-readable storage medium according to this embodiment. It should be noted that the technical solution of this storage medium and the technical solution of the aforementioned method for implementing incident neutron localization by a neutron detector share the same concept. For details not described in detail in the technical solution of the storage medium, please refer to the description of the technical solution of the aforementioned method for implementing incident neutron localization by a neutron detector.

[0112] The preferred embodiments of the present invention are described above with reference to the accompanying drawings, but are not intended to limit the scope of the present invention. Any modifications, equivalent substitutions, and improvements made by those skilled in the art without departing from the scope and essence of the present invention shall fall within the scope of the present invention.

Claims

1. A method for realizing incident neutron positioning by a neutron detector, characterized in that: include: The neutron detector is provided with a boron-coated scintillation crystal having a boron-coated film by performing a boron coating treatment on the surface of the scintillation crystal of the neutron detector; After obtaining a neutron detector having a boron-coated scintillation crystal with a boron-coated film, pulse waveform data of each channel of the neutron detector is collected according to a trigger signal generated by each event, and a charge ratio of the pulse waveform data of each channel of each event is calculated by a charge integration method; Using the charge ratio of the pulse waveform data of each channel of each event, determining whether each event is a neutron event or a gamma event; When determining that an event is a neutron event, a two-dimensional Gaussian distribution method of a photon response function is used to calculate the incident position of the neutron when the neutron event occurs.

2. The method according to claim 1, characterized in that The neutron detector of the scintillation crystal coated with a boron film is obtained by performing a boron film coating process on the surface of the scintillation crystal of the neutron detector, and comprises: Performing boron coating treatment on the surface of the scintillation crystal by electrostatic spraying process to form a neutron detector of the boron-coated scintillation crystal with a boron coating; or Boron carbide B4C or boron oxide B2O3 thin film is deposited on the surface of scintillation crystal by direct current magnetron sputtering to obtain a neutron detector of boron-coated scintillation crystal with boron-coated film.

3. The method according to claim 1, characterized in that The method of collecting the pulse waveform data of each channel of the neutron detector according to the trigger signal generated by each event and calculating the charge ratio of the pulse waveform data of each channel of each event by using the charge integration method includes: Collect pulse waveform data of each channel of the neutron detector according to the trigger signal generated by each event, and calculate the total pulse waveform data of each event; The sum pulse waveform data of each event is processed in sections to obtain two sections of sum pulse waveform data, and the charge amount of each section of sum pulse waveform data is calculated by using a charge integration method; According to the charge amount of each segment of the total pulse waveform data, the charge ratio of the pulse waveform data of each channel of each event is obtained.

4. The method according to claim 3, characterized in that The method of determining whether each event is a neutron event or a gamma event by using the charge ratio of the pulse waveform data of each channel of each event comprises: By performing statistical processing on the charge ratios of the pulse waveform data of each channel of each event, a charge ratio distribution diagram of all events is formed; According to the charge ratio distribution diagram of all the events, a charge ratio threshold for determining neutron events and gamma events is determined, and each event is determined to be a neutron event or a gamma event according to the charge ratio threshold.

5. The method according to claim 4, characterized in that The step of determining whether each event is a neutron event or a gamma event according to the charge ratio threshold value comprises: If the charge ratio of the pulse waveform data of each channel of the event is greater than the charge ratio threshold, the event is determined to be a neutron event; If the charge ratio of the pulse waveform data of each channel of the event is not greater than the charge ratio threshold, the event is determined to be a gamma event.

6. The method according to claim 1, characterized in that The method of using a two-dimensional Gaussian distribution method of a photon response function to calculate the incident position of a neutron when the neutron event occurs includes: According to the photon intensity generated by the nuclear reaction of neutrons at the neutron incident position, a Gaussian distribution expression of the two-dimensional photon intensity is constructed; By performing a series of matrix transformations and matrix decomposition processes on the Gaussian distribution expression of the two-dimensional photon intensity, the incident position of the neutron when the neutron event occurs is obtained.

7. The method according to claim 6, characterized in that The Gaussian distribution expression of the two-dimensional photon intensity includes: Among them, Q xi,yi are the photon intensities collected by the silicon photomultiplier tubes SiPM in the i-th row and i-th column respectively; σ x and σ y are the photon distribution broadening in the x-direction and y-direction respectively; Q b is the background photon intensity and noise; x i and i are the row and column positions of each SiPM pixel respectively; x0 and y0 are the row and column positions of the actual incident neutron respectively; A is the actual luminous intensity.

8. A device for realizing incident neutron positioning by a neutron detector, characterized in that: include: A boron coating film processing module is used to obtain a neutron detector having a boron-coated scintillation crystal by performing a boron coating film processing on the surface of the scintillation crystal of the neutron detector; A neutron determination module is used to collect pulse waveform data of each channel of the neutron detector according to a trigger signal generated by each event after obtaining a neutron detector having a boron-coated scintillation crystal with a boron-coated film, and calculate the charge ratio of the pulse waveform data of each channel of each event by using a charge integration method; Using the charge ratio of the pulse waveform data of each channel of each event, determining whether each event is a neutron event or a gamma event; The neutron positioning module is used to calculate the incident position of the neutron when the neutron event occurs by using the two-dimensional Gaussian distribution method of the photon response function when the event is determined to be a neutron event.

9. A computing device comprising: Memory and processor; The memory is used to store computer executable instructions, and the processor is used to execute the computer executable instructions. When the computer executable instructions are executed by the processor, the steps of the method for locating incident neutrons by the neutron detector described in any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium storing computer-executable instructions, which, when executed by a processor, implement the steps of the method for locating incident neutrons by a neutron detector as claimed in any one of claims 1 to 7.

Images