Dynamic PSD threshold correction method, device and equipment suitable for digital pulse waveform discrimination

Abstract

The application provides a dynamic PSD threshold correction method, device and equipment suitable for digital pulse waveform discrimination, and relates to the technical field of nuclear radiation detection. The method comprises the following steps: obtaining a current PSD-energy two-dimensional spectrum by using a nuclear radiation detection instrument, eliminating counts in a target energy range in the current PSD-energy two-dimensional spectrum, and converting the current PSD-energy two-dimensional spectrum into a one-dimensional PSD spectrum by using a preset formula; determining the position of the maximum peak and the half-height width in the one-dimensional PSD spectrum, determining a PSD threshold, and resetting a target PSD value range according to the PSD threshold; obtaining a target PSD-energy two-dimensional spectrum again, counting a discrimination target ray count value and a total count value, determining a main target ray count value according to the difference between the total count value and the discrimination target ray count value, and determining a main target ray count rate and a discrimination target ray count rate. By periodically and automatically analyzing the PSD-energy two-dimensional spectrum and dynamically adjusting the PSD threshold, the application can more accurately discriminate different particles, and improves the accuracy and efficiency of particle detection.

Description

Technical Field

[0001] This invention relates to the field of nuclear radiation detection technology, and in particular to a dynamic PSD threshold correction method, apparatus and equipment suitable for digital pulse waveform discrimination. Background Technology

[0002] In the field of nuclear radiation detection, digital pulse shape discrimination (PSD) is a commonly used particle identification method. Different particles produce different emission time constants in a scintillator, resulting in varying electrical signal waveforms output by the photomultiplier tube. By amplifying the electrical signal using a current-sensitive preamplifier circuit and acquiring digital pulse waveform data using a digital multichannel analyzer (MCA), particle identification can be further performed using PSD algorithms, such as charge comparison, rise time analysis, frequency domain analysis, and intelligent analysis. Taking the charge comparison method as an example, this method calculates the total pulse charge Q, the fast component charge Qf, and the slow component charge Qs, and defines the PSD value as Qf / Q or Qs / Q for particle identification. For instance, when using NaIL crystals to identify neutrons and gamma rays, the pulse signal produced by neutrons has a smaller time constant than that of gamma rays; therefore, the particle type can be determined by comparing Qf / Q with a specific PSD threshold.

[0003] However, traditional PSD technology has a significant problem: the luminous efficiency and luminescence time constant of the scintillator are directly affected by ambient temperature, causing shifts in the energy spectrum and PSD spectrum measured at different temperatures. When the PSD threshold is fixed, temperature changes can lead to discrimination errors, thus affecting the discrimination effect and detection efficiency of particle detection. For example, the position of the background PSD peak and the PSD value at the center of the AmBe source both change significantly at different temperatures. To solve the above problems, existing technologies typically employ a temperature-based PSD threshold correction method. This method requires dynamically setting the PSD threshold according to the operating ambient temperature of the detection instrument. The specific process includes steps such as conducting energy calibration experiments, setting energy calibration coefficients, measuring the two-dimensional energy-PSD spectrum, changing the operating ambient temperature and measuring, and determining the correspondence between the PSD threshold and temperature. However, this method has the following drawbacks: First, each radiation detection instrument needs to undergo individual pre-shipment testing to determine the correspondence between the operating ambient temperature and the PSD threshold, which places extremely high demands on the consistency of components such as the scintillator, photomultiplier tube, and preamplifier circuit. Second, considering that the equipment needs several hours to reach thermal equilibrium after adjusting the operating ambient temperature, and that as many operating ambient temperature points as possible are needed to accurately represent the correspondence, the factory testing time will increase significantly, failing to meet the needs of large-scale production. Furthermore, prolonged temperature testing may negatively impact the paint and circuitry of the equipment, increasing the risk of equipment damage. Third, the sensitivity of temperature sensors, scintillators, photomultiplier tubes, and preamplifier circuits to temperature changes is not consistent, and changes in temperature sensor readings cannot fully match the performance changes of other components, potentially leading to inaccurate PSD threshold correction. Finally, after long-term use, the performance of various components of the nuclear radiation detection instrument may change, causing the correspondence between the operating ambient temperature and PSD threshold determined at the time of shipment to be inconsistent with the real-time status of the equipment, thus affecting the accuracy of PSD threshold correction.

[0004] Currently, there is no technical solution that can solve the above-mentioned technical problems, and there is no dynamic PSD threshold correction method, device, or equipment suitable for digital pulse waveform identification. Summary of the Invention

[0005] This invention provides a dynamic PSD threshold correction method, apparatus, and device suitable for digital pulse waveform discrimination, which achieves dynamic correction of the PSD threshold in a more efficient and accurate manner, thereby improving the accuracy and reliability of nuclear radiation detection.

[0006] In a first aspect, the present invention provides a dynamic PSD threshold correction method suitable for digital pulse waveform discrimination, comprising:

[0007] The current PSD-energy two-dimensional spectrum is obtained using a nuclear radiation detection instrument. The working time of the nuclear radiation detection instrument is counted. At each preset PSD threshold correction cycle, the counts in the target energy range of the current PSD-energy two-dimensional spectrum are removed. The spectrum is then converted into a one-dimensional PSD spectrum using a preset formula.

[0008] The location of the maximum peak and the full width at half maximum (FWHM) are determined in the one-dimensional PSD spectrum. A PSD threshold is determined based on the location of the maximum peak and the FWHM value, so as to reset the target PSD value range of the nuclear radiation detection instrument according to the PSD threshold.

[0009] The target PSD-energy two-dimensional spectrum is obtained again using the nuclear radiation detection instrument. The count values ​​of the identified target rays and the total value within the target energy range and the target PSD value range in the target PSD-energy two-dimensional spectrum are counted. Based on the difference between the total value and the count value of the identified target rays, the count value of the main target rays is determined, so as to determine the count rate of the main target rays and the count rate of the identified target rays.

[0010] According to the dynamic PSD threshold correction method for digital pulse waveform discrimination provided by the present invention, before obtaining the current PSD-energy two-dimensional spectrum using a nuclear radiation detection instrument, the method further includes:

[0011] Define the main target ray, the distinguishing target ray, and the preset PSD threshold correction period of the nuclear radiation detection instrument;

[0012] Based on the energy calibration test of the nuclear radiation detection instrument, the energy calibration coefficient is set;

[0013] Based on the two-dimensional spectrum measurement of the energy-PSD value of the nuclear radiation detection instrument, the target energy range and the target PSD value range of the target radiation are determined.

[0014] According to the dynamic PSD threshold correction method for digital pulse waveform discrimination provided by the present invention, the main target ray is a gamma ray, the discrimination target ray is a neutron, and the preset PSD threshold correction period is 600 seconds.

[0015] The target energy range is 3.0 MeV to 3.5 MeV, and the target PSD value range is 0.63 to 0.73;

[0016] The primary target ray count rate is the gamma ray count rate, and the distinguishing target ray count rate is the neutron count rate.

[0017] According to the dynamic PSD threshold correction method for digital pulse waveform discrimination provided by the present invention, after obtaining the current PSD-energy two-dimensional spectrum using a nuclear radiation detection instrument, the method further includes:

[0018] When the working time of the nuclear radiation detection instrument is less than or equal to the preset PSD threshold correction cycle, the count value of the identified target rays and the total value in the current PSD-energy two-dimensional spectrum within the target energy range and the target PSD value range are statistically analyzed. Based on the total value and the count value of the identified target rays, the count value of the main target rays is determined, so as to determine the count rate of the main target rays and the count rate of the identified target rays.

[0019] According to the dynamic PSD threshold correction method for digital pulse waveform discrimination provided by the present invention, the step of converting the PSD spectrum into a one-dimensional PSD spectrum using a preset formula includes:

[0020]

[0021] in, PSD value; Energy value; This refers to the count value per unit PSD and per unit energy value at a specific point in the PSD-energy two-dimensional spectrum. To determine the upper limit of the target energy of the target ray, To identify the lower limit of the target energy of the target ray, To set the upper limit of the energy range for energy spectrum measurements of nuclear radiation detection instruments. The lower limit of the energy range for energy spectrum measurement of nuclear radiation detection instruments. It is the count value at a certain PSD value in the one-dimensional PSD spectrum.

[0022] According to the dynamic PSD threshold correction method for digital pulse waveform discrimination provided by the present invention, determining the location of the maximum peak and the full width at half maximum (FWHM) in the one-dimensional PSD spectrum includes:

[0023] Traverse the one-dimensional PSD spectrum to find all local maximum points. A local maximum point is a point whose value is greater than the values ​​to its left and right. Determine all candidate peaks based on all local maximum points, and determine the candidate peak with the largest count value as the maximum peak. The location of the maximum peak is the PSD value corresponding to the horizontal coordinate of the maximum peak.

[0024] Find the points where the count first falls below the half-height value at the rising and falling edges of the maximum peak, and record them as the left half-height position and the right half-height position. Determine the half-height width based on the left half-height position and the right half-height position. The half-height value is the corresponding value of half the position of the maximum peak.

[0025] According to the dynamic PSD threshold correction method for digital pulse waveform discrimination provided by the present invention, the step of statistically analyzing the target ray count and total value within the target energy range and target PSD value range in the target PSD-energy two-dimensional spectrum includes:

[0026] Based on the upper limit of the target energy of the target ray, the lower limit of the target energy of the target ray, and the range of the target PSD value, the count value of the target ray in the target PSD-energy two-dimensional spectrum is calculated.

[0027] Based on the upper limit of the energy range for energy spectrum measurement by the nuclear radiation detection instrument and the lower limit of the energy range for energy spectrum measurement by the nuclear radiation detection instrument, the total value in the target PSD-energy two-dimensional spectrum is calculated.

[0028] According to the dynamic PSD threshold correction method for digital pulse waveform discrimination provided by the present invention, after determining the main target ray count value, the method further includes:

[0029] Get the current measurement duration;

[0030] The target ray count rate is determined based on the quotient of the target ray count value and the current measurement duration.

[0031] The main target ray count rate is determined based on the quotient of the main target ray count value and the current measurement duration.

[0032] Secondly, a dynamic PSD threshold correction device suitable for digital pulse waveform discrimination is provided, comprising:

[0033] The acquisition unit is used to acquire the current PSD-energy two-dimensional spectrum using a nuclear radiation detection instrument, count the working time of the nuclear radiation detection instrument, remove the counts in the target energy range in the current PSD-energy two-dimensional spectrum at each preset PSD threshold correction cycle, and convert it into a one-dimensional PSD spectrum using a preset formula.

[0034] The determining unit is used to determine the location of the maximum peak and the full width at half maximum (FWHM) in the one-dimensional PSD spectrum, and to determine a PSD threshold based on the location of the maximum peak and the FWHM, so as to reset the target PSD value range of the nuclear radiation detection instrument based on the PSD threshold.

[0035] The statistical unit is used to acquire the target PSD-energy two-dimensional spectrum again using the nuclear radiation detection instrument, and to count the target ray counts and total values ​​within the target energy range and target PSD value range in the target PSD-energy two-dimensional spectrum. Based on the difference between the total value and the target ray counts, the main target ray count value is determined, so as to determine the main target ray count rate and the target ray count rate.

[0036] Thirdly, an electronic device is provided, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor, when executing the program, implements the dynamic PSD threshold correction method suitable for digital pulse waveform discrimination.

[0037] The dynamic PSD threshold correction method provided by this invention significantly reduces the testing steps required before the equipment leaves the factory compared with the temperature measurement-based correction method, thereby reducing production and calibration costs and meeting the needs of large-scale production; by avoiding long-term temperature testing, it effectively reduces the negative impact of testing on equipment performance, such as damage to paint, circuits and other components.

[0038] The dynamic PSD threshold correction method provided by this invention is more accurate than temperature-based correction methods because it not only considers changes in ambient temperature but also dynamically adjusts the PSD threshold by analyzing the PSD-energy two-dimensional spectrum in real time. This more accurately reflects the actual performance of the nuclear radiation detection instrument. It avoids the need for periodic temperature tests during equipment use to re-establish the "temperature-PSD threshold" relationship, improving the ease of use and maintenance efficiency of the equipment. Dynamic PSD threshold correction can respond promptly to changes in the overall performance of the nuclear radiation detection instrument, not just changes in ambient temperature, thus improving the reliability of the equipment. By analyzing the PSD-energy two-dimensional spectrum in real time and dynamically adjusting the PSD threshold, the method of this application can more accurately distinguish different particles, improving the accuracy and efficiency of particle detection. Attached Figure Description

[0039] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0040] Figure 1 This is a schematic diagram of the charge comparison method in the prior art;

[0041] Figure 2 This is one of the existing PSD testing diagrams;

[0042] Figure 3 This is the second schematic diagram of PSD testing in existing technology;

[0043] Figure 4 This is the third schematic diagram of PSD testing in existing technology;

[0044] Figure 5 This is a flowchart illustrating the process of nuclear radiation detectors before they leave the factory in the current technology.

[0045] Figure 6 This is a flowchart illustrating the operation of existing nuclear radiation detectors.

[0046] Figure 7 This is a flowchart illustrating the dynamic PSD threshold correction method for digital pulse waveform discrimination provided by the present invention.

[0047] Figure 8 This is a schematic diagram of the process before the nuclear radiation detector provided by this invention leaves the factory;

[0048] Figure 9 This is a schematic diagram of the process of using the nuclear radiation detector provided by the present invention;

[0049] Figure 10 This is a schematic diagram of the structure of the dynamic PSD threshold correction device for digital pulse waveform discrimination provided by the present invention;

[0050] Figure 11 This is a schematic diagram of the structure of the electronic device provided by the present invention. Detailed Implementation

[0051] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0052] Digital pulse waveform discrimination (PSD) technology is commonly used in nuclear radiation detection instruments to distinguish different particles during radiation measurements. For example, it's used to distinguish alpha and beta rays when measuring alpha and beta rays using plastic scintillators, and to distinguish neutrons and gamma rays when measuring neutrons and gamma rays using crystal scintillators. Its main working principle is that different particles, such as electrons, alpha particles, and protons, cause different emission time constants in the scintillator, resulting in different waveforms in the electrical signals output by the photomultiplier tube. This electrical signal is amplified using a current-sensitive preamplifier circuit and then input into a digital multichannel analyzer to obtain digital pulse waveform data. PSD discrimination algorithms include charge comparison, rise time, frequency domain analysis, and intelligent analysis methods, such as... Figure 1 As shown, taking the charge comparison method as an example:

[0053] Let Q be the total pulse charge, Qf be the fast component charge, and Qs be the slow component charge. The ratios Qf / Q, Qs / Q, and Qf / Qs will differ for different particles. The PSD value is defined as follows:

[0054]

[0055] The charge comparison method identifies particles based on differences in PSD values. Taking the differentiation of neutrons and gamma rays using NaIL crystals as an example, the pulse signal generated by a neutron has a smaller time constant than that of a gamma ray. Therefore, if Qf / Q is greater than a certain PSD threshold, it can be identified as a neutron; if Qf / Q is less than the PSD threshold, it can be identified as a gamma ray.

[0056] However, the luminous efficiency and luminous time constant of a scintillator are directly affected by ambient temperature. Therefore, the energy spectrum and PSD spectrum measured at different temperatures will shift with temperature changes. When the PSD threshold is fixed, temperature changes can lead to discrimination errors, thus affecting the particle detection discrimination effect and detection efficiency.

[0057] like Figure 2 As shown, after being kept at 25°C for several hours, the background PSD peak position is 484 (i.e., 0.59), the AmBe source center PSD value is about 548 (i.e., 0.67), and the K-40 full-energy peak position is 300.

[0058] like Figure 3 As shown, after being kept at -20℃ for several hours, the background PSD peak position is at channel 345 (i.e., 0.42), the PSD value at the AmBe source center is about channel 384 (i.e., 0.47), and the K-40 full-energy peak position is at channel 300.

[0059] like Figure 4As shown, after being kept at 50℃ for several hours, the background PSD peak position is at channel 526 (i.e., 0.64), the PSD value at the AmBe source center is about channel 610 (i.e., 0.74), and the K-40 full-energy peak position is at channel 300.

[0060] To avoid the aforementioned problems, the PSD threshold generally needs to be dynamically set based on the operating temperature of the detection instrument. Taking the use of a NaIL crystal-based nuclear radiation detection instrument for neutron and gamma-ray discrimination as an example, steps 1-7 are required before the equipment leaves the factory; the remaining steps are automatically implemented during equipment use and require no manual operation. This can be referenced... Figure 5 The flowchart illustrating the operation of existing nuclear radiation detectors can be found by referring to... Figure 6 Specifically, the main workflow is as follows:

[0061] 1. Define the main target rays and identify target rays for nuclear radiation detection instruments.

[0062] 2. Conduct energy calibration tests on nuclear radiation detection instruments and set energy calibration coefficients.

[0063] 3. Using nuclear radiation detection instruments and a radioactive source that generates the target radiation to identify the target, a two-dimensional spectrum of energy-PSD values ​​is obtained to clarify the target energy range of the target radiation.

[0064] 4. Change the operating temperature of the nuclear radiation detection instrument and maintain it for several hours to allow the equipment to reach thermal equilibrium.

[0065] 5. Nuclear radiation detection instruments measure ambient temperature and energy-PSD values ​​in a two-dimensional spectrum (using a radiation source that generates the target-discriminating rays).

[0066] 6. Determine the PSD threshold at the operating ambient temperature and establish the correspondence between the operating ambient temperature and the PSD threshold.

[0067] 7. Determine whether the temperature test covers the operating environment temperature range. If yes, end the temperature characteristic test; otherwise, return to step 4.

[0068] 8. Measurements were taken using a nuclear radiation detection instrument to obtain the PSD-energy two-dimensional spectrum P1 and the temperature measurement value T.

[0069] 9. Determine the PSD threshold based on the temperature measurement value T.

[0070] 10. Statistically count the number of discriminative target rays in the two-dimensional PSD-energy spectrum P1 within the target energy range and the target PSD value range. The calculation formula is as follows:

[0071]

[0072] in Units in PSD-energy two-dimensional spectrum and unit The count value on; PSD threshold; and These are the upper and lower limits of the target energy for identifying the target ray, respectively.

[0073] 11. Statistical analysis of the total count in the PSD-energy two-dimensional spectrum P1 The calculation formula is as follows:

[0074]

[0075] in and These are the upper and lower limits of energy for energy spectrum measurements performed by nuclear radiation detection instruments.

[0076] 12. Calculate the count of the main target rays. The formula is as follows:

[0077]

[0078] 13. Complete subsequent count rate and dose rate calculations, energy spectrum and PSD value spectrum statistics, and display of energy spectrum-PSD two-dimensional spectrum, energy spectrum and PSD spectrum.

[0079] However, the design approach in the existing technology has the following problems:

[0080] 1. Due to the consistency issues of the scintillators, photomultiplier tubes, preamplifier circuits, temperature sensors, charge integration window selection, etc. used in nuclear radiation detection instruments, each radiation detection instrument needs to undergo individual pre-shipment testing to determine the correspondence between the operating environment temperature and the PSD threshold.

[0081] 2. The above-mentioned work of determining the correspondence between working environment temperature and PSD threshold takes into account that the equipment needs several hours to reach thermal equilibrium after the working environment temperature is adjusted, and as many working environment temperature points as possible are needed to accurately represent the correspondence. Therefore, the factory test time will be significantly increased, which does not meet the needs of large-scale production.

[0082] 3. Temperature characteristic tests are somewhat destructive, and prolonged testing may have a negative impact on the paint, circuitry, and other components of the equipment.

[0083] 4. Temperature sensors, scintillators, photomultiplier tubes, preamplifier circuits, etc., do not have consistent sensitivity to temperature changes. The change in temperature sensor readings cannot fully match the performance changes of the other parts, which may lead to inaccurate correction of the PSD threshold based on the change in temperature sensor readings during equipment use.

[0084] 5. After long-term use, the performance of the temperature sensor, scintillator, photomultiplier tube, preamplifier circuit, etc. of the nuclear radiation detection instrument may change, causing the correspondence between the working environment temperature and PSD threshold determined at the factory to be inconsistent with the real-time status of the equipment, resulting in inaccurate correction of the PSD threshold based on changes in temperature sensor readings.

[0085] To address the aforementioned technical problems, this application proposes a dynamic PSD threshold correction method, apparatus, and device suitable for digital pulse waveform discrimination. Figure 7 This is a flowchart illustrating the dynamic PSD threshold correction method for digital pulse waveform discrimination provided by the present invention. The dynamic PSD threshold correction method for digital pulse waveform discrimination includes:

[0086] Step 101: Use a nuclear radiation detection instrument to obtain the current PSD-energy two-dimensional spectrum, count the working time of the nuclear radiation detection instrument, and at each preset PSD threshold correction cycle, remove the counts in the target energy range in the current PSD-energy two-dimensional spectrum, and convert it into a one-dimensional PSD spectrum using a preset formula.

[0087] Step 102: Determine the location of the maximum peak and the full width at half maximum (FWHM) in the one-dimensional PSD spectrum. Determine the PSD threshold based on the location of the maximum peak and the FWHM value, and reset the target PSD value range of the nuclear radiation detection instrument based on the PSD threshold.

[0088] Step 103: Use the nuclear radiation detection instrument again to acquire the target PSD-energy two-dimensional spectrum, and count the target ray counts and total values ​​within the target energy range and target PSD value range in the target PSD-energy two-dimensional spectrum. Based on the difference between the total value and the target ray counts, determine the main target ray count value, and thus determine the main target ray count rate and the target ray count rate.

[0089] In step 101, radiation measurement is performed using a nuclear radiation detection instrument to collect the current PSD-energy two-dimensional spectrum data. This step involves using a photomultiplier tube, a preamplifier circuit, and a digital multichannel analyzer (MCA) to capture and record the pulse waveform and energy information of the radiation signal, and checking whether the working time of the nuclear radiation detection instrument is greater than the preset PSD threshold correction period. This period can be set according to actual application requirements and equipment performance, such as 500s, 600s, or 700s. Those skilled in the art will understand that this application describes a technical solution using NaIL crystals for n / γ discrimination as an example. In fact, the method described in this application can be used to discriminate other particles (such as alpha / beta rays) using other materials (such as plastic scintillators or CLYC crystals). In this case, the main target ray, the discriminated target ray, the energy range of the discriminated target ray, and the PSD value range of the discriminated target ray will also be different values. For example, the PSD threshold correction period is set to 600s, but depending on the application scenario, it can also be set to 60s or 6000s in other embodiments.

[0090] Optionally, the working time of the nuclear radiation detection instrument is recorded, and a preset PSD threshold correction cycle is performed at each interval. Assuming that the preset PSD threshold correction cycle is 10 minutes, the nuclear radiation detection instrument needs to be corrected after the working time exceeds 10 minutes. That is, in this application, a correction is performed every 10 minutes.

[0091] If the working time meets the requirements, counts within the target energy range in the current PSD-energy two-dimensional spectrum are removed. This step is to avoid the influence of target ray (such as neutron) counts on subsequent PSD spectrum analysis. A preset formula is then used to convert the PSD-energy two-dimensional spectrum after count removal into a one-dimensional PSD spectrum. This formula may involve integration or summation operations over the energy dimension to obtain a one-dimensional distribution related only to the PSD value. Optionally, this invention can also use machine learning algorithms to intelligently identify and remove counts within the target energy range to improve the accuracy and efficiency of preprocessing. In addition to the PSD-energy two-dimensional spectrum, information from other dimensions (such as time, location, etc.) can be considered for comprehensive analysis to improve the accuracy of spectrum conversion.

[0092] Optionally, before acquiring the current PSD-energy two-dimensional spectrum using nuclear radiation detection instruments, the method further includes:

[0093] Define the main target ray, the distinguishing target ray, and the preset PSD threshold correction period of the nuclear radiation detection instrument;

[0094] Based on the energy calibration test of the nuclear radiation detection instrument, the energy calibration coefficient is set;

[0095] Based on the two-dimensional spectrum measurement of the energy-PSD value of the nuclear radiation detection instrument, the target energy range and the target PSD value range of the target radiation are determined.

[0096] Optionally, based on the actual application scenario, determine the primary ray types to focus on and identify other ray types that need to be differentiated from the main target ray. Based on equipment stability and application requirements, set an appropriate PSD threshold correction cycle. This cycle determines how often the equipment performs automatic PSD threshold correction to ensure accurate differentiation. Optionally, the PSD threshold correction cycle can be dynamically adjusted based on the equipment's real-time operating status or environmental conditions. For example, when the equipment's operating temperature fluctuates significantly, the correction cycle can be shortened.

[0097] Optionally, an energy calibration test can be performed on the nuclear radiation detection instrument using a radioactive source of known energy, recording the response values ​​at different energies. Based on the results of the energy calibration test, an energy calibration coefficient is calculated to convert the instrument's response value into an actual energy value. This coefficient is typically a linear or nonlinear function used to calibrate the instrument's energy response. For instruments with a large energy response range, a multi-segment calibration method can be used, calibrating different energy segments separately to improve calibration accuracy.

[0098] Optionally, a nuclear radiation detection instrument is used to measure the radioactive source containing the target ray to obtain a two-dimensional energy-PSD spectrum. The energy-PSD spectrum shows the distribution of PSD values ​​at different energies. Based on the results of the two-dimensional spectrum, the main energy distribution range of the target ray is determined. This main energy distribution range is typically determined by analyzing the peaks, width, and shape of the spectrum. Similarly, based on the results of the two-dimensional spectrum, the PSD value range corresponding to the target ray is determined. This PSD value range is used to determine the particle type during subsequent particle identification.

[0099] In an optional embodiment, the primary target ray is a gamma ray, the discrimination target ray is a neutron, and the preset PSD threshold correction period is 600 seconds;

[0100] The target energy range is 3.0 MeV to 3.5 MeV, and the target PSD value range is 0.63 to 0.73;

[0101] The primary target ray count rate is the gamma ray count rate, and the distinguishing target ray count rate is the neutron count rate.

[0102] Optionally, after acquiring the current PSD-energy two-dimensional spectrum using nuclear radiation detection instruments, the method further includes:

[0103] When the working time of the nuclear radiation detection instrument is less than or equal to the preset PSD threshold correction cycle, the count value of the identified target rays and the total value in the current PSD-energy two-dimensional spectrum within the target energy range and the target PSD value range are statistically analyzed. Based on the total value and the count value of the identified target rays, the count value of the main target rays is determined, so as to determine the count rate of the main target rays and the count rate of the identified target rays.

[0104] In this optional embodiment, a supplementary processing step is provided in the dynamic PSD threshold correction method when the operating time of the nuclear radiation detection instrument is less than or equal to a preset PSD threshold correction cycle. This ensures that even when the PSD threshold correction cycle is not reached, the currently acquired PSD-energy two-dimensional spectrum can still be effectively analyzed to statistically identify the target rays and the main target rays, and further calculate their count rate. Specifically, firstly, the system checks whether the operating time of the nuclear radiation detection instrument is less than or equal to the preset PSD threshold correction cycle. This is a key condition for determining whether to execute subsequent statistical steps. If the operating time condition is met, the system filters data points from the currently acquired PSD-energy two-dimensional spectrum that are within the target energy range and the target PSD value range. These data points correspond to the count of the identified target rays. The system counts the number of these filtered data points, i.e., the count value of the identified target rays. Simultaneously, the system also counts the total number of data points in the entire PSD-energy two-dimensional spectrum, i.e., the total value. This total value represents the total number of all detected rays. Based on the total value and the identified target ray count, the system determines the count of the primary target ray by calculating their difference. This is because the total value includes all detected rays, while the identified target ray count represents a specific type of ray. Finally, the system calculates the count rate of the identified target ray and the primary target ray based on the identified target ray count, the primary target ray count, and the current measurement duration. The count rate is the number of rays detected per unit time and is an important indicator for assessing ray intensity.

[0105] Optionally, the conversion to a one-dimensional PSD spectrum using a preset formula includes:

[0106]

[0107] in, PSD value; Energy value; This refers to the count value per unit PSD and per unit energy value at a specific point in the PSD-energy two-dimensional spectrum. To determine the upper limit of the target energy of the target ray, To identify the lower limit of the target energy of the target ray, To set the upper limit of the energy range for energy spectrum measurements of nuclear radiation detection instruments. The lower limit of the energy range for energy spectrum measurement of nuclear radiation detection instruments. It is the count value at a certain PSD value in the one-dimensional PSD spectrum.

[0108] In step 102, the largest peak is searched in the one-dimensional PSD spectrum, and its PSD peak position K and full width at half maximum (FWHM) are recorded. This step can be achieved by traversing the spectrum data and finding local maxima. A new PSD threshold is calculated based on the PSD peak position K and FWHM, which depends on the application requirements and equipment characteristics. The target PSD value range of the nuclear radiation detection instrument is reset based on the calculated PSD threshold to ensure the accuracy of subsequent particle identification.

[0109] Optionally, determining the location of the maximum peak and the full width at half maximum (FWHM) in the one-dimensional PSD spectrum includes:

[0110] Traverse the one-dimensional PSD spectrum to find all local maximum points. A local maximum point is a point whose value is greater than the values ​​to its left and right. Determine all candidate peaks based on all local maximum points, and determine the candidate peak with the largest count value as the maximum peak. The location of the maximum peak is the PSD value corresponding to the horizontal coordinate of the maximum peak.

[0111] Find the points where the count first falls below the half-height value at the rising and falling edges of the maximum peak, and record them as the left half-height position and the right half-height position. Determine the half-height width based on the left half-height position and the right half-height position. The half-height value is the corresponding value of half the position of the maximum peak.

[0112] Optionally, starting from the starting point of the one-dimensional PSD spectrum, each data point is traversed sequentially until the end of the spectrum is reached. For each data point, its value is compared with the values ​​of the adjacent data points to its left and right. If the value of the data point is greater than the values ​​of the data points to its left and right, the point is considered a local maximum. The positions of all found local maximum points and their corresponding PSD values ​​are recorded. Each local maximum point and its adjacent data points within a certain range are considered as a candidate peak. This range can be determined according to the actual application requirements and the characteristics of the spectral data. For each candidate peak, the sum of the PSD values ​​of all the data points it contains is calculated as the count value of the candidate peak. The count values ​​of all candidate peaks are compared, and the candidate peak with the largest count value is determined as the maximum peak.

[0113] Furthermore, the half-height value is calculated based on the PSD value of the location of the maximum peak. The half-height value is usually defined as half of the maximum peak's PSD value. Starting from the left side of the maximum peak, the search proceeds to the right until the first point with a PSD value lower than the half-height value is found, which is denoted as the left half-height position. Similarly, starting from the right side of the maximum peak, the search proceeds to the left until the first point with a PSD value lower than the half-height value is found, which is denoted as the right half-height position. When searching for the left and right half-height positions, strategies such as linear search and binary search can be used to improve efficiency. The result of subtracting the x-coordinate of the left half-height position from the x-coordinate of the right half-height position is the half-height width.

[0114] In step 103, radiation measurements are performed again using a nuclear radiation detection instrument to obtain target PSD-energy two-dimensional spectrum data. This step is similar to the data acquisition in step 101, but its purpose is to apply a newly set PSD threshold for particle discrimination, statistically analyzing the count values ​​and total values ​​of discriminated target rays within the target energy range and target PSD value range in the target PSD-energy two-dimensional spectrum. This involves traversing the spectrum data and applying preset energy and PSD value ranges for filtering and counting. The main target ray count value is determined based on the difference between the total value and the discriminated target ray count value, and the main target ray count rate and discriminated target ray count rate are further calculated. The ultimate purpose of this invention is particle discrimination to assess the relative content or intensity of different particles.

[0115] Optionally, the step of statistically analyzing the target ray count and total value within the target energy range and target PSD value range in the target PSD-energy two-dimensional spectrum includes:

[0116] Based on the upper limit of the target energy of the target ray, the lower limit of the target energy of the target ray, and the range of the target PSD value, the count value of the target ray in the target PSD-energy two-dimensional spectrum is calculated.

[0117] Based on the upper limit of the energy range for energy spectrum measurement by the nuclear radiation detection instrument and the lower limit of the energy range for energy spectrum measurement by the nuclear radiation detection instrument, the total value in the target PSD-energy two-dimensional spectrum is calculated.

[0118] Optionally, it is necessary to define the upper and lower limits of the target energy for identifying the target ray. These two values ​​are determined based on actual application requirements and equipment characteristics, and are used to define the energy range of interest. Similarly, it is also necessary to define the target PSD value range. This range corresponds to the characteristics of the target ray in the PSD dimension. By iterating through each data point in the target PSD-energy two-dimensional spectrum, the data points that meet the conditions are counted, and the total number obtained is the count value of the target ray. Likewise, the upper and lower limits of the energy range for energy spectrum measurement by the nuclear radiation detection instrument must be defined. These two values ​​define the entire energy range that the equipment can detect. By iterating through each data point in the target PSD-energy two-dimensional spectrum, the data points that meet the conditions are counted, and the total number obtained is the total value. This value represents the total number of all rays detected within the entire energy spectrum measurement range.

[0119] Optionally, after determining the primary target ray count, the method further includes:

[0120] Get the current measurement duration;

[0121] The target ray count rate is determined based on the quotient of the target ray count value and the current measurement duration.

[0122] The main target ray count rate is determined based on the quotient of the main target ray count value and the current measurement duration.

[0123] Optionally, when the nuclear radiation detection instrument starts working, a timer is started or an initial timestamp is recorded. During the detection process, the current timestamp is continuously recorded or updated. When it is necessary to calculate the count rate, the current timestamp is read and subtracted from the initial timestamp to obtain the current measurement duration. The count rate of the identified target rays refers to the number of identified target rays detected per unit time. The count rate of the identified target rays is obtained by dividing the statistically obtained count value of the identified target rays by the current measurement duration. Similarly, the count rate of the main target rays refers to the number of main target rays detected per unit time. The count rate of the main target rays is obtained by dividing the previously determined count value of the main target rays by the current measurement duration.

[0124] Figure 8 This is a schematic diagram of the process before the nuclear radiation detector provided by this invention leaves the factory. Figure 9 This is a flowchart illustrating the operation of the nuclear radiation detector provided by this invention. Taking the use of a NaIL crystal-based nuclear radiation detector to distinguish neutrons and gamma rays as an example, the specific implementation method is explained. Steps 1-3 are required before the equipment leaves the factory; the remaining steps are automatically implemented during equipment use and require no manual operation.

[0125] 1. Define the primary target ray, the discrimination target ray, and the PSD threshold correction period for the nuclear radiation detection instrument. For example, define gamma rays as the primary target ray, neutrons as the discrimination target ray, and the PSD threshold correction period as 600 s. In this case, the PSD threshold needs to be corrected every 600 seconds of operation.

[0126] 2. Conduct energy calibration tests on nuclear radiation detection instruments and set energy calibration coefficients.

[0127] 3. Conduct two-dimensional energy-PSD value measurements using nuclear radiation detection instruments to clearly define the target energy range and target PSD value range for identifying target rays. For example, using an AmBe source and measuring the energy-PSD value two-dimensional spectrum, the experimental results can be used to clearly define and set the target energy range for identifying target rays as 3.0 MeV to 3.5 MeV, with a PSD threshold of 0.63. That is, only particles with energies in the 3.0 MeV to 3.5 MeV range and PSD values ​​greater than 0.63 will be identified as neutrons.

[0128] 4. Use a nuclear radiation detection instrument to measure and obtain the PSD-energy two-dimensional spectrum P1. Determine whether PSD threshold correction is needed based on the equipment operating time and PSD threshold correction cycle. If not, proceed to step 8; if yes, proceed to the next step.

[0129] 5. Remove the counts within the target energy range from the PSD-energy two-dimensional spectrum P1 and convert it into a one-dimensional PSD spectrum P2.

[0130] 6. Find the largest peak in the one-dimensional PSD spectrum P2, and record the PSD peak position K and full width at half maximum (FWHM).

[0131] 7. Calculate and reset the PSD threshold based on the PSD peak position K and the full width at half maximum (FWHM). For example, the PSD threshold can be calculated using the following formula:

[0132]

[0133] 8. Statistical analysis of target ray counts .

[0134] 9. Total Count .

[0135] 10. Calculate the count of the main target rays. .

[0136] 11. Complete subsequent count rate calculations, such as neutron count rate. The calculation formula is:

[0137]

[0138] The formula for calculating the gamma count rate is:

[0139]

[0140] in For measuring time.

[0141] The dynamic PSD threshold correction method provided by this invention significantly reduces the testing steps required before the equipment leaves the factory compared with the temperature measurement-based correction method, thereby reducing production and calibration costs and meeting the needs of large-scale production; by avoiding long-term temperature testing, it effectively reduces the negative impact of testing on equipment performance, such as damage to paint, circuits and other components.

[0142] The dynamic PSD threshold correction method provided by this invention is more accurate than temperature-based correction methods because it not only considers changes in ambient temperature but also dynamically adjusts the PSD threshold by analyzing the PSD-energy two-dimensional spectrum in real time. This more accurately reflects the actual performance of the nuclear radiation detection instrument. It avoids the need for periodic temperature tests during equipment use to re-establish the "temperature-PSD threshold" relationship, improving the ease of use and maintenance efficiency of the equipment. Dynamic PSD threshold correction can respond promptly to changes in the overall performance of the nuclear radiation detection instrument, not just changes in ambient temperature, thus improving the reliability of the equipment. By analyzing the PSD-energy two-dimensional spectrum in real time and dynamically adjusting the PSD threshold, the method of this application can more accurately distinguish different particles, improving the accuracy and efficiency of particle detection.

[0143] Figure 10 This is a schematic diagram of the structure of the dynamic PSD threshold correction device for digital pulse waveform identification provided by the present invention. The dynamic PSD threshold correction device for digital pulse waveform identification includes an acquisition unit 1. The acquisition unit 1 is used to acquire the current PSD-energy two-dimensional spectrum using a nuclear radiation detection instrument, count the working time of the nuclear radiation detection instrument, remove the counts in the target energy range in the current PSD-energy two-dimensional spectrum at preset PSD threshold correction intervals, and convert it into a one-dimensional PSD spectrum using a preset formula. The working principle of the acquisition unit 1 can be referred to the aforementioned step 101, and will not be repeated here.

[0144] The dynamic PSD threshold correction device for digital pulse waveform discrimination further includes a determination unit 2. The determination unit 2 is used to determine the location of the maximum peak and the half-width at half-maximum in the one-dimensional PSD spectrum, and determine the PSD threshold based on the location of the maximum peak and the value of the half-width at half-maximum, so as to reset the target PSD value range of the nuclear radiation detection instrument according to the PSD threshold. The working principle of the determination unit 2 can be referred to the aforementioned step 102, and will not be repeated here.

[0145] The dynamic PSD threshold correction device for digital pulse waveform discrimination further includes a statistical unit 3. The statistical unit 3 is used to obtain the target PSD-energy two-dimensional spectrum again using the nuclear radiation detection instrument, and to count the target ray count value and total value in the target PSD-energy two-dimensional spectrum within the target energy range and the target PSD value range. Based on the difference between the total value and the target ray count value, the main target ray count value is determined, so as to determine the main target ray count rate and the target ray count rate. The working principle of the statistical unit 3 can be referred to the aforementioned step 103, and will not be repeated here.

[0146] The dynamic PSD threshold correction method provided by this invention significantly reduces the testing steps required before the equipment leaves the factory compared with the temperature measurement-based correction method, thereby reducing production and calibration costs and meeting the needs of large-scale production; by avoiding long-term temperature testing, it effectively reduces the negative impact of testing on equipment performance, such as damage to paint, circuits and other components.

[0147] The dynamic PSD threshold correction method provided by this invention is more accurate than temperature-based correction methods because it not only considers changes in ambient temperature but also dynamically adjusts the PSD threshold by analyzing the PSD-energy two-dimensional spectrum in real time. This more accurately reflects the actual performance of the nuclear radiation detection instrument. It avoids the need for periodic temperature tests during equipment use to re-establish the "temperature-PSD threshold" relationship, improving the ease of use and maintenance efficiency of the equipment. Dynamic PSD threshold correction can respond promptly to changes in the overall performance of the nuclear radiation detection instrument, not just changes in ambient temperature, thus improving the reliability of the equipment. By analyzing the PSD-energy two-dimensional spectrum in real time and dynamically adjusting the PSD threshold, the method of this application can more accurately distinguish different particles, improving the accuracy and efficiency of particle detection.

[0148] Figure 11 This is a schematic diagram of the structure of the electronic device provided by the present invention. For example... Figure 11As shown, the electronic device may include: a processor 110, a communications interface 120, a memory 130, and a communications bus 140, wherein the processor 110, the communications interface 120, and the memory 130 communicate with each other through the communications bus 140. Processor 110 can call logic instructions in memory 130 to execute a dynamic PSD threshold correction method suitable for digital pulse waveform discrimination. This method includes: acquiring a current PSD-energy two-dimensional spectrum using a nuclear radiation detection instrument; calculating the operating time of the nuclear radiation detection instrument; at preset PSD threshold correction intervals, eliminating counts within the target energy range of the current PSD-energy two-dimensional spectrum; converting the spectrum into a one-dimensional PSD spectrum using a preset formula; determining the location of the maximum peak and its half-width at half-maximum (WHM) in the one-dimensional PSD spectrum; determining a PSD threshold based on the location of the maximum peak and the WHM; resetting the target PSD value range of the nuclear radiation detection instrument based on the PSD threshold; acquiring the target PSD-energy two-dimensional spectrum again using the nuclear radiation detection instrument; calculating the discrimination target ray counts and total values ​​within the target energy range and target PSD value range in the target PSD-energy two-dimensional spectrum; determining the main target ray count value based on the difference between the total value and the discrimination target ray count value; and determining the main target ray count rate and the discrimination target ray count rate.

[0149] Furthermore, the logical instructions in the aforementioned memory 130 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, essentially, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0150] On the other hand, the present invention also provides a computer program product, which includes a computer program that can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute a dynamic PSD threshold correction method for digital pulse waveform discrimination provided by the above methods. The method includes: acquiring the current PSD-energy two-dimensional spectrum using a nuclear radiation detection instrument, counting the working time of the nuclear radiation detection instrument, setting a preset PSD threshold correction cycle at each interval, removing the counts in the target energy range in the current PSD-energy two-dimensional spectrum, and converting it into a one-dimensional PSD spectrum using a preset formula. The location of the maximum peak and its full width at half maximum (FWHM) are determined in the one-dimensional PSD spectrum. A PSD threshold is determined based on the location of the maximum peak and the FWHM value. The target PSD value range of the nuclear radiation detection instrument is then reset based on the PSD threshold. The target PSD-energy two-dimensional spectrum is acquired again using the nuclear radiation detection instrument. The count values ​​of the identified target rays and the total count value within the target energy range and the target PSD value range in the target PSD-energy two-dimensional spectrum are statistically analyzed. The main target ray count value is determined based on the difference between the total count value and the identified target ray count value. This determines the main target ray count rate and the identified target ray count rate.

[0151] In another aspect, the present invention also provides a non-transitory computer-readable storage medium storing a computer program thereon. When executed by a processor, the computer program performs the dynamic PSD threshold correction method for digital pulse waveform discrimination provided by the methods described above. This method includes: acquiring a current PSD-energy two-dimensional spectrum using a nuclear radiation detection instrument; counting the operating time of the nuclear radiation detection instrument; removing counts within a target energy range from the current PSD-energy two-dimensional spectrum at preset PSD threshold correction intervals; converting the spectrum to a one-dimensional PSD spectrum using a preset formula; and determining the maximum peak in the one-dimensional PSD spectrum. The location and half-width at half-maximum (WHM) of the maximum peak are used to determine the PSD threshold. The target PSD value range of the nuclear radiation detection instrument is then reset based on this threshold. The target PSD-energy two-dimensional spectrum is acquired again using the nuclear radiation detection instrument. The count values ​​of the identified target rays within the target energy range and the target PSD value range, along with the total count value, are statistically analyzed. The difference between the total count value and the identified target ray count value is used to determine the main target ray count rate and the identified target ray count rate.

[0152] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0153] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0154] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A dynamic PSD threshold correction method suitable for digitized pulse waveform discrimination, characterized by, The method comprises the following steps: obtaining a current PSD-energy two-dimensional spectrum by using a nuclear radiation detection instrument, counting the working time of the nuclear radiation detection instrument, eliminating the count in the target energy range in the current PSD-energy two-dimensional spectrum every preset PSD threshold correction period, and converting the current PSD-energy two-dimensional spectrum into a one-dimensional PSD spectrum by using a preset formula; determining the position of the maximum peak and the half-height width in the one-dimensional PSD spectrum, determining the PSD threshold according to the position of the maximum peak and the value of the half-height width, and resetting the target PSD value range of the nuclear radiation detection instrument according to the PSD threshold, and defining the PSD value as Qf / Q, wherein Qf is the charge amount of the fast component, and Q is the total pulse charge amount; obtaining a target PSD-energy two-dimensional spectrum by using the nuclear radiation detection instrument again, counting the discrimination target ray count value and the total count value in the target energy range and the target PSD value range in the target PSD-energy two-dimensional spectrum, and determining the main target ray count value according to the difference between the total count value and the discrimination target ray count value, so as to determine the main target ray count rate and the discrimination target ray count rate; Before obtaining the current PSD-energy two-dimensional spectrum by using the nuclear radiation detection instrument, the method further comprises the following steps: defining the main target ray, the discrimination target ray and the preset PSD threshold correction period of the nuclear radiation detection instrument; setting an energy calibration coefficient according to the energy calibration test of the nuclear radiation detection instrument; determining the target energy range and the target PSD value range of the discrimination target ray according to the energy-PSD value two-dimensional spectrum measurement of the nuclear radiation detection instrument.

2. The dynamic PSD threshold correction method for digitized pulse waveform discrimination according to claim 1, wherein, The main target ray is a gamma ray, the discrimination target ray is a neutron, and the preset PSD threshold correction period is 600 seconds. The target energy range is 3.0 MeV to 3.5 MeV, and the target PSD value range is 0.63 to 0.

73. The main target ray count rate is a gamma ray count rate, and the discrimination target ray count rate is a neutron count rate.

3. The method for dynamic PSD threshold correction suitable for digitized pulse waveform discrimination according to claim 1, wherein, After obtaining the current PSD-energy two-dimensional spectrum by using the nuclear radiation detection instrument, the method further comprises the following steps: in the case that the working time of the nuclear radiation detection instrument is less than or equal to the preset PSD threshold correction period, counting the discrimination target ray count value and the total count value in the target energy range and the target PSD value range in the current PSD-energy two-dimensional spectrum, and determining the main target ray count value according to the total count value and the discrimination target ray count value, so as to determine the main target ray count rate and the discrimination target ray count rate.

4. The method for dynamic PSD threshold correction suitable for digitized pulse waveform discrimination according to claim 1, wherein, The conversion into a one-dimensional PSD spectrum by using a preset formula comprises the following steps: ； wherein, is a PSD value; is an energy value; is a count value of unit PSD value, unit energy value at a certain place in the PSD-energy two-dimensional spectrum, is an upper limit of target energy for discriminating target rays, is a lower limit of target energy for discriminating target rays, is an upper limit of energy range for energy spectrum measurement by a nuclear radiation detection instrument, is a lower limit of energy range for energy spectrum measurement by a nuclear radiation detection instrument, is a count value at a certain PSD value in a one-dimensional PSD spectrum.

5. The method for dynamic PSD threshold correction suitable for digitized pulse waveform discrimination according to claim 1, wherein, The determination of the position of the maximum peak and the half-height width in the one-dimensional PSD spectrum comprises the following steps: traversing the one-dimensional PSD spectrum to find all local maximum points, the local maximum point being a point whose value is greater than the values of the points on the left and right sides thereof, determining all candidate peaks according to all local maximum points, and determining the candidate peak with the largest count value as the maximum peak, the position of the maximum peak being the PSD value corresponding to the horizontal coordinate of the maximum peak; The left half-height position and the right half-height position are found respectively at the rising edge and the falling edge of the maximum peak, and the half-height width is determined according to the left half-height position and the right half-height position, and the half-height value is a corresponding value of half of the position of the maximum peak.

6. The method for dynamic PSD threshold correction suitable for digitized pulse waveform discrimination according to claim 1, wherein, The method comprises the following steps: According to the upper limit of the target energy of the discriminated target ray, the lower limit of the target energy of the discriminated target ray, and the target PSD value range, the discriminated target ray count value in the target PSD-energy two-dimensional spectrum is counted. According to the upper limit of the energy range for spectrum measurement of the nuclear radiation detection instrument and the lower limit of the energy range for spectrum measurement of the nuclear radiation detection instrument, the total count value in the target PSD-energy two-dimensional spectrum is counted.

7. The method for dynamic PSD threshold correction suitable for digitized pulse waveform discrimination according to claim 1, wherein, After determining the main target ray count value, the method further comprises the following steps: Obtaining a current measurement duration; According to the quotient value of the discriminated target ray count value and the current measurement duration, a discriminated target ray count rate is determined. According to the quotient value of the main target ray count value and the current measurement duration, a main target ray count rate is determined.

8. A dynamic PSD threshold correction device for digitized pulse waveform discrimination, for implementing the dynamic PSD threshold correction method for digitized pulse waveform discrimination according to any one of claims 1 to 7, characterized in that, The method comprises the following steps: An acquisition unit is configured to acquire a current PSD-energy two-dimensional spectrum by using a nuclear radiation detection instrument, count the working duration of the nuclear radiation detection instrument, eliminate the counts in the target energy range in the current PSD-energy two-dimensional spectrum every preset PSD threshold correction period, and convert the current PSD-energy two-dimensional spectrum into a one-dimensional PSD spectrum by using a preset formula; A determination unit is configured to determine the position of a maximum peak and a half-height width in the one-dimensional PSD spectrum, determine a PSD threshold according to the position of the maximum peak and the value of the half-height width, and reset the target PSD value range of the nuclear radiation detection instrument according to the PSD threshold; A statistical unit is configured to acquire a target PSD-energy two-dimensional spectrum by using the nuclear radiation detection instrument again, count the discriminated target ray count value and the total count value in the target energy range and the target PSD value range in the target PSD-energy two-dimensional spectrum, and determine a main target ray count value according to the difference between the total count value and the discriminated target ray count value, so as to determine a main target ray count rate and a discriminated target ray count rate.

9. An electronic device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, The processor implements the dynamic PSD threshold correction method for discriminating a digitized pulse waveform according to any one of claims 1 to 7 when executing the program.

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