Digital adaptive passive peak stabilizing method for γ-ray energy spectrum measurement and analysis
By employing a digital adaptive passive peak stabilization method, utilizing gamma-ray energy spectrum calibration and adaptive peak stabilization steps, the problem of peak position drift caused by ambient temperature in gamma-ray energy spectrum measurement is solved, achieving stable and accurate measurement under different environments and reducing costs.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- XIAN CNNC NUCLEAR INSTRUMENT CO LTD
- Filing Date
- 2025-12-18
- Publication Date
- 2026-06-25
AI Technical Summary
In existing gamma-ray energy spectrum measurement and analysis, the peak position shift caused by changes in ambient temperature is a problem. In particular, passive methods are insufficient in terms of stability and accuracy. Furthermore, existing digital correction methods have high algorithm requirements and are costly.
A digital adaptive passive peak stabilization method is adopted. Through gamma-ray energy spectrum calibration, preheating and adaptive peak stabilization steps, peak drift is identified using a standard radioactive source and nuclide library. The energy spectrum is adaptively adjusted under different environments, including fast preheating and slow preheating modes. Combined with NaI and lanthanum peak references, passive stabilization is achieved.
It achieves passive stability and accuracy in various environments, reduces costs, can automatically identify and correct peak drift, adapt to changes in the external radiation field, and ensure the stability and reliability of the detector.
Smart Images
Figure CN2025143366_25062026_PF_FP_ABST
Abstract
Description
A digital adaptive passive peak stabilization method for gamma-ray energy spectrum measurement and analysis Technical Field
[0001] This invention belongs to the field of nuclear energy spectrum processing technology, specifically relating to a digital adaptive passive peak stabilization method for gamma-ray energy spectrum measurement and analysis. Background Technology
[0002] In gamma-ray measurement and analysis systems, the performance of passive components such as amplifiers, photoelectric converters, resistors, and capacitors can change significantly due to the influence of ambient heat and device heat dissipation. This causes the peak position of the measured energy spectrum to drift with temperature changes, affecting the accuracy of the measurement.
[0003] Currently, gamma spectral stabilization mainly involves two steps: peak drift identification and peak drift correction. Peak drift identification is divided into two methods: active and passive. The active method uses a reference energy peak formed by an LED light source or a radiation source with known energy in the gamma ray measurement and analysis system as a reference peak. The deviation between the measured energy and the calibrated energy is used as the basis for peak drift judgment. This method has strong anti-interference ability, but because it introduces an additional incident source, it will cause some interference to normal measurement, which is particularly noticeable when using an LED light source. On the other hand, using a radiation source will increase the cost of the measurement system and management costs. In contrast, the passive method not only does not introduce interference, but also does not incur high manufacturing and maintenance costs, making it an economical method, but its stability and accuracy are poor.
[0004] In addition, there are two methods for correcting peak drift: analog and digital. The analog method is achieved by adjusting the high voltage and amplifier amplification factor. However, this method has no feedback mechanism and is highly dependent on the performance of analog devices in unknown environments. It may even increase the risk of drift. The digital method is more flexible, has lower maintenance costs, and is more precise in operation. It is a promising method for correcting energy spectrum drift, but it has higher requirements for the correction algorithm. Technical issues
[0005] The technical problem to be solved by the present invention is to provide a digital adaptive passive peak stabilization method for gamma-ray energy spectrum measurement and analysis, which addresses the shortcomings of the prior art. Technical solutions
[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a digital adaptive passive peak stabilization method for gamma-ray energy spectrum measurement and analysis, characterized in that the method includes the following steps:
[0007] Step 1: Gamma-ray energy spectrum calibration of the radiation detection instrument: The radiation detection instrument is calibrated with a gamma-ray energy spectrum at a standard temperature using a known standard radiation source that emits gamma rays of a specific energy.
[0008] Step 2: Power on the radiation detection instrument;
[0009] Step 3: Preheat the radiation detection instrument and perform initial energy spectrum drift correction, as follows:
[0010] Step 301: When the preheating environment meets the background environmental conditions, or when the preheating environment does not meet the background environmental conditions but the γ-ray energy of the interfering nuclide in the preheating environment is less than the full-energy peak position of the reference peak of the standard radioactive source, proceed to step 302; when the preheating environment does not meet the background environmental conditions but the γ-ray energy of the interfering nuclide in the preheating environment is not less than the full-energy peak position of the reference peak of the standard radioactive source, proceed to step 303.
[0011] Step 302: Quickly record the initial energy spectrum drift caused by changes in ambient temperature after the radiation detection instrument is powered on. Then, it enters the fast preheating mode. If the spectrum is stabilized within 1000s of the running measurement time in the fast preheating mode, the radiation detector ends the preheating and completes the initial energy spectrum drift correction. If the spectrum is not stabilized within 1000s of the running measurement time in the fast preheating mode, the slow preheating mode is turned on. The slow preheating mode is only run once. After the slow preheating mode ends, the initial energy spectrum drift correction is completed.
[0012] The fast preheating mode: Peak search is performed once per fast peak search cycle, address The peak location of the full-energy peak in the peak finding results is compared with that of the standard radioactive source reference peak. Results comparison, when the road address With the address When the difference is less than the first threshold, then the address The result is the actual measured peak of the full-energy peak of the standard radioactive source reference peak, recording the drift in the fast preheating mode. Subtract each channel of the measured energy spectrum in sequence The value is used to complete the initial energy spectrum drift correction, where, Number the road address and , This represents the total number of road addresses;
[0013] The slow preheating mode: sets a second threshold and searches for peaks, with the channel address within the second threshold... The peak finding result is the actual measured peak of the full-energy peak of the standard radioactive source reference peak, and the drift amount in the slow preheating mode is recorded. Subtract each channel of the measured energy spectrum in sequence The value is used to complete the initial energy spectrum drift correction, where the second threshold is greater than the first threshold;
[0014] Step 303: Query the address corresponding to the energy of a specific nuclide in the nuclide library. Peak search is performed once per rapid peak search cycle, and the route address is [not specified]. In the peak finding results and the road address The results showed that the peak finding result was matched with the energy only when the channel address difference was less than the first threshold, and only the corresponding number of energy values were matched. Number of energies of nuclides compared to the current comparison If they match, the current nuclide is considered to have matched successfully, and the difference between the maximum energy peak of the current match and the energy of the corresponding nuclide ray is calculated. Subtract each channel of the measured energy spectrum in sequence Value, to complete the initial energy spectrum drift correction;
[0015] Step 4: Adaptive peak stabilization of radiation detection instruments, the process is as follows:
[0016] Step 401: After the radiation detection instrument has warmed up, it enters the adaptive peak stabilization state. At this time, the radiation detection instrument can enter any radiation field to start measurement, and record the initial peak finding results and the corresponding trace address. ,extract The highest energy peak ;
[0017] Step 402: Perform real-time measurements using a radiation detection instrument, performing peak retrieval once per rapid peak retrieval cycle, and obtain the current peak retrieval result and the corresponding trace address. ,extract The highest energy peak ,in, It is a positive integer not less than 1;
[0018] Step 403, when and When the difference is less than the first threshold, it is considered that the peak positions of the previous and subsequent peak searches correspond to the same γ-ray. The forward drift amount L is obtained, and the L value is subtracted from each channel of the measured energy spectrum in turn to complete the energy spectrum drift correction. The peak search results are not retained.
[0019] when and When the difference is not less than the first threshold, it indicates that the detected nuclide has changed. The current peak finding result will be retained, and step 402 will be repeated until the measurement work is completed, so as to realize the adaptive selection of energy peak stabilization spectrum according to the change of γ radiation field.
[0020] The aforementioned digital adaptive passive peak stabilization method for gamma-ray energy spectrum measurement and analysis is characterized in that: the radiation detection instrument includes a NaI radiation detection instrument and Radiation detection instruments;
[0021] When using a NaI radiation detector, natural radiation is employed. The peak is used as a reference peak for peak stabilization;
[0022] When radiation detection instruments are used When using radiation detection instruments, the lanthanum peak is used as a reference peak for peak stabilization.
[0023] The above-mentioned digital adaptive passive peak stabilization method for gamma-ray energy spectrum measurement and analysis is characterized in that the rapid peak finding period is 30s to 100s.
[0024] The above-mentioned digital adaptive passive peak stabilization method for gamma-ray energy spectrum measurement and analysis is characterized in that: the first threshold is 5 to 15 channels; and the second threshold is 30 to 50 channels. Beneficial effects
[0025] Compared with the prior art, the present invention has the following advantages:
[0026] 1. This invention accurately identifies and corrects peak drift through a digital passive method, and stabilizes the energy spectrum through an adaptive method. It can not only ensure normal operation when interference sources are present, but also adaptively select energy peaks for stabilization, making it easy to promote and use.
[0027] 2. This invention can not only identify drift in passive conditions and when there is a large temperature difference, but also automatically identify the interference radiation field in the environment, correctly identify the amount of drift, and can adaptively identify changes in nuclides in the external radiation field to stabilize the peak under normal working conditions, thereby ensuring that the detector is stable and reliable in various environments and has good performance.
[0028] 3. The method of the present invention has simple steps, lower time, capital and management costs, and has very good application prospects, making it easy to promote and use.
[0029] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description
[0030] Figure 1 is a flowchart of the method of the present invention. Embodiments of the present invention
[0031] As shown in Figure 1, a digital adaptive passive peak stabilization method for γ-ray energy spectrum measurement and analysis according to the present invention includes the following steps:
[0032] Step 1: Gamma-ray energy spectrum calibration of the radiation detection instrument: The radiation detection instrument is calibrated with a gamma-ray energy spectrum at a standard temperature using a known standard radiation source that emits gamma rays of a specific energy.
[0033] It should be noted that gamma-ray energy calibration is a process used in fields such as nuclear physics, radioactivity detection, and environmental monitoring to calibrate gamma-ray spectrometers, ensuring that the instrument can accurately measure the energy of gamma rays. A standard radioactive source is placed in front of the detector of the gamma spectrometer, ensuring its position is fixed so that gamma rays can be incident perpendicularly onto the detector. The gamma spectrometer is then activated, allowing the detector to collect gamma-ray energy spectra for a certain period. During this process, gamma rays generate electron-hole pairs in the detector, which are processed by the electronics system to form an energy spectrum. On the energy spectrum, gamma rays of different energies will form different peaks. The energy peaks corresponding to each standard radioactive source can be identified through the energy spectrum. The energy calibration coefficient is calculated, and an energy calibration curve is plotted using the energies of multiple standard radioactive sources and the peak positions measured by the instrument. This curve is usually a straight line, and the best-fit line is obtained by fitting the curve using the least squares method. The accuracy of the calibration is verified using standard radioactive sources that were not involved in establishing the calibration curve. If the gamma-ray energies of these sources obtained through the calibration curve match the actual values, the calibration is accurate. When actually measuring unknown radioactive sources, the established energy calibration curve is used to correct the energy values measured by the instrument, thereby obtaining accurate gamma-ray energies.
[0034] Step 2: Power on the radiation detection instrument;
[0035] Step 3: Preheat the radiation detection instrument and perform initial energy spectrum drift correction, as follows:
[0036] Step 301: When the preheating environment meets the background environmental conditions, or when the preheating environment does not meet the background environmental conditions but the γ-ray energy of the interfering nuclide in the preheating environment is less than the full-energy peak position of the reference peak of the standard radioactive source, proceed to step 302; when the preheating environment does not meet the background environmental conditions but the γ-ray energy of the interfering nuclide in the preheating environment is not less than the full-energy peak position of the reference peak of the standard radioactive source, proceed to step 303.
[0037] Step 302: Quickly record the initial energy spectrum drift caused by changes in ambient temperature after the radiation detection instrument is powered on. Then, it enters the fast preheating mode. If the spectrum is stabilized within 1000s of the running measurement time in the fast preheating mode, the radiation detector ends the preheating and completes the initial energy spectrum drift correction. If the spectrum is not stabilized within 1000s of the running measurement time in the fast preheating mode, the slow preheating mode is turned on. The slow preheating mode is only run once. After the slow preheating mode ends, the initial energy spectrum drift correction is completed.
[0038] The fast preheating mode: Peak search is performed once per fast peak search cycle, address The peak location of the full-energy peak in the peak finding results is compared with that of the standard radioactive source reference peak. Results comparison, when the road address With the address When the difference is less than the first threshold, then the address The result is the actual measured peak of the full-energy peak of the standard radioactive source reference peak, recording the drift in the fast preheating mode. Subtract each channel of the measured energy spectrum in sequence The value is used to complete the initial energy spectrum drift correction, where, Number the road address and , This represents the total number of road addresses;
[0039] The slow preheating mode: sets a second threshold and searches for peaks, with the channel address within the second threshold... The peak finding result is the actual measured peak of the full-energy peak of the standard radioactive source reference peak, and the drift amount in the slow preheating mode is recorded. Subtract each channel of the measured energy spectrum in sequence The value is used to complete the initial energy spectrum drift correction, where the second threshold is greater than the first threshold;
[0040] Step 303: Query the address corresponding to the energy of a specific nuclide in the nuclide library. Peak search is performed once per rapid peak search cycle, and the route address is [not specified]. In the peak finding results and the road address The results showed that the peak finding result was matched with the energy only when the channel address difference was less than the first threshold, and only the corresponding number of energy values were matched. Number of energies of nuclides compared to the current comparison If they match, the current nuclide is considered to have matched successfully, and the difference between the maximum energy peak of the current match and the energy of the corresponding nuclide ray is calculated. Subtract each channel of the measured energy spectrum in sequence Value, to complete the initial energy spectrum drift correction;
[0041] Step 4: Adaptive peak stabilization of radiation detection instruments, the process is as follows:
[0042] Step 401: After the radiation detection instrument has warmed up, it enters the adaptive peak stabilization state. At this time, the radiation detection instrument can enter any radiation field to start measurement, and record the initial peak finding results and the corresponding trace address. ,extract The highest energy peak ;
[0043] Step 402: Perform real-time measurements using a radiation detection instrument, performing peak retrieval once per rapid peak retrieval cycle, and obtain the current peak retrieval result and the corresponding trace address. ,extract The highest energy peak ,in, It is a positive integer not less than 1;
[0044] Step 403, when and When the difference is less than the first threshold, it is considered that the peak positions of the previous and subsequent peak searches correspond to the same γ-ray. The forward drift amount L is obtained, and the L value is subtracted from each channel of the measured energy spectrum in turn to complete the energy spectrum drift correction. The peak search results are not retained.
[0045] when and When the difference is not less than the first threshold, it indicates that the detected nuclide has changed. The current peak finding result will be retained, and step 402 will be repeated until the measurement work is completed, so as to realize the adaptive selection of energy peak stabilization spectrum according to the change of γ radiation field.
[0046] In this embodiment, the radiation detection instrument includes a NaI radiation detection instrument and Radiation detection instruments;
[0047] When using a NaI radiation detector, natural radiation is employed. The peak is used as a reference peak for peak stabilization;
[0048] When radiation detection instruments are used When using radiation detection instruments, the lanthanum peak is used as a reference peak for peak stabilization.
[0049] In this embodiment, the rapid peak finding period is 30s to 100s.
[0050] In this embodiment, the first threshold is 5 to 15 channels; the second threshold is 30 to 50 channels.
[0051] When used, this invention accurately identifies and corrects peak drift through a digital passive method, and stabilizes the energy spectrum through an adaptive method. It not only ensures normal operation in the presence of interference sources, but also adaptively selects energy peaks for stabilization. It can identify drift not only in passive conditions and under large temperature differences, but also automatically identify interference radiation fields in the environment, correctly identify the amount of drift, and adaptively identify changes in nuclides in the external radiation field for adaptive peak stabilization under normal operating conditions. This ensures the detector is stable and reliable in various environments. It requires less time, money, and management costs, and has very good application prospects.
[0052] The above description is merely a preferred embodiment of the present invention and does not constitute any limitation on the present invention. Any simple modifications, alterations, or equivalent structural changes made to the above embodiments based on the technical essence of the present invention shall still fall within the protection scope of the present invention.
Claims
1. A digital adaptive passive peak stabilization method for gamma-ray energy spectrum measurement and analysis, characterized in that, The method includes the following steps: Step 1: Gamma-ray energy spectrum calibration of the radiation detection instrument: The radiation detection instrument is calibrated with a gamma-ray energy spectrum at a standard temperature using a known standard radiation source that emits gamma rays of a specific energy. Step 2: Power on the radiation detection instrument; Step 3: Preheat the radiation detection instrument and perform initial energy spectrum drift correction, as follows: Step 301: When the preheating environment meets the background environmental conditions, or when the preheating environment does not meet the background environmental conditions but the γ-ray energy of the interfering nuclide in the preheating environment is less than the full-energy peak position of the reference peak of the standard radioactive source, proceed to step 302; when the preheating environment does not meet the background environmental conditions but the γ-ray energy of the interfering nuclide in the preheating environment is not less than the full-energy peak position of the reference peak of the standard radioactive source, proceed to step 303. Step 302: Quickly record the initial energy spectrum drift caused by changes in ambient temperature after the radiation detection instrument is powered on. Then, it enters the fast preheating mode. If the spectrum is stabilized within 1000s of the running measurement time in the fast preheating mode, the radiation detector ends the preheating and completes the initial energy spectrum drift correction. If the spectrum is not stabilized within 1000s of the running measurement time in the fast preheating mode, the slow preheating mode is turned on. The slow preheating mode is only run once. After the slow preheating mode ends, the initial energy spectrum drift correction is completed. The fast preheating mode: Peak search is performed once per fast peak search cycle, address The peak location of the full-energy peak in the peak finding results is compared with that of the standard radioactive source reference peak. Results comparison, when the road address With the address When the difference is less than the first threshold, then the address The result is the actual measured peak of the full-energy peak of the standard radioactive source reference peak, recording the drift in the fast preheating mode. Subtract each channel of the measured energy spectrum in sequence The value is used to complete the initial energy spectrum drift correction, where, Number the road address and ， This represents the total number of road addresses; The slow preheating mode: sets a second threshold and searches for peaks, with the channel address within the second threshold... The peak finding result is the actual measured peak of the full-energy peak of the standard radioactive source reference peak, and the drift amount in the slow preheating mode is recorded. Subtract each channel of the measured energy spectrum in sequence The value is used to complete the initial energy spectrum drift correction, where the second threshold is greater than the first threshold; Step 303: Query the address corresponding to the energy of a specific nuclide in the nuclide library. Peak search is performed once per rapid peak search cycle, and the route address is [not specified]. In the peak finding results and the road address The results showed that the peak finding result was matched with the energy only when the channel address difference was less than the first threshold, and only the corresponding number of energy values were matched. Number of nuclides compared to the current comparison If they match, the current nuclide is considered to have matched successfully, and the difference between the maximum energy peak of the current match and the energy of the corresponding nuclide ray is calculated. Subtract each channel of the measured energy spectrum in sequence Value, to complete the initial energy spectrum drift correction; Step 4: Adaptive peak stabilization of radiation detection instruments, the process is as follows: Step 401: After the radiation detection instrument has warmed up, it enters the adaptive peak stabilization state. At this time, the radiation detection instrument can enter any radiation field to start measurement, and record the initial peak finding results and the corresponding trace address. ,extract The highest energy peak ； Step 402: Perform real-time measurements using a radiation detection instrument, performing peak retrieval once per rapid peak retrieval cycle, and obtain the current peak retrieval result and the corresponding trace address. ,extract The highest energy peak ,in, It is a positive integer not less than 1; Step 403, when and When the difference is less than the first threshold, it is considered that the peak positions of the previous and subsequent peak searches correspond to the same γ-ray. The forward drift amount L is obtained, and the L value is subtracted from each channel of the measured energy spectrum in turn to complete the energy spectrum drift correction. The peak search results are not retained. when and When the difference is not less than the first threshold, it indicates that the detected nuclide has changed. The current peak finding result will be retained, and step 402 will be repeated until the measurement work is completed, so as to realize the adaptive selection of energy peak stabilization spectrum according to the change of γ radiation field.
2. The digital adaptive passive peak stabilization method for gamma-ray energy spectrum measurement and analysis according to claim 1, characterized in that: The radiation detection instruments include NaI radiation detection instruments and Radiation detection instruments; When using a NaI radiation detector, natural radiation is employed. The peak is used as a reference peak for peak stabilization; When radiation detection instruments are used When using radiation detection instruments, the lanthanum peak is used as a reference peak for peak stabilization.
3. The digital adaptive passive peak stabilization method for gamma-ray energy spectrum measurement and analysis according to claim 1, characterized in that: The rapid peak-finding cycle is 30s to 100s.
4. A digital adaptive passive peak stabilization method for gamma-ray energy spectrum measurement and analysis according to claim 1, characterized in that: The first threshold is 5 to 15 channels; the second threshold is 30 to 50 channels.