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Method for gradually approximating scale gamma energy spectrum high-energy region based on peak shape fitting

A technology of gradual approximation and gamma energy spectrum, applied in the field of nuclear radiation detection, can solve problems such as difficulty in large-scale popularization and application, inability to use a scale for a long time, and the influence of electronic parameters of scintillator light output.

Active Publication Date: 2020-08-25
INST OF NUCLEAR PHYSICS & CHEM CHINA ACADEMY OF +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] For an ideal scintillation gamma spectrometer, the light yield is constant and has nothing to do with the incident gamma ray energy. The total fluorescence quantity is proportional to the gamma ray deposition energy. The phenomenon that the energy of the high-energy detector deviates from the linearity is far away; at the same time, the light output of the scintillator and the electronic parameters are greatly affected by factors such as temperature, so it cannot be used for a long time at one time.
At present, when the scintillation spectrometer is used to analyze the high-energy section of the neutron activation gamma energy spectrum, the on-site calibration method of the experimenter is generally used to determine the track interval of the energy section of interest. This method requires the operator to have professional knowledge and analysis experience in radiation measurement, and the cost is relatively high. Difficult to promote and apply on a large scale

Method used

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  • Method for gradually approximating scale gamma energy spectrum high-energy region based on peak shape fitting
  • Method for gradually approximating scale gamma energy spectrum high-energy region based on peak shape fitting
  • Method for gradually approximating scale gamma energy spectrum high-energy region based on peak shape fitting

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specific Embodiment approach

[0056] combine figure 1 , the specific embodiment of a method for gradually approximating the high-energy region of the scale γ energy spectrum based on peak shape fitting is as follows:

[0057] (a) use 137 Preliminary calibration of the detector for the Cs radioactive source;

[0058] (b) use 60 The Co radioactive source calibrates the detector in the low energy range;

[0059] (c) Using moderated neutron-activated water samples to expand the energy scale range to the mid-energy range;

[0060] (d) Using moderated neutrons to activate graphite samples to expand the energy scale range to the mid-high energy range;

[0061] (e) Using moderated neutrons to activate the iron block sample to expand the energy scale range to the high energy range;

[0062] (f) Calculate the corresponding address range of the high-energy region of interest in the γ-energy spectrum.

[0063] This method is aimed at neutron activation analysis, and all operations rely on the neutron activation ...

Embodiment

[0094] In this example, the Mon-card simulation method is used to obtain the deposition energy spectrum of the detector, and LaBr is used 3 is a gamma detector crystal material, the energy resolution is 2.9%@661.7keV, 2.1%@1332.5keV, 1.6%@2615keV, the relationship between the detector's full width at half maximum and energy is First, the Mongolian card simulation method is used to obtain 137 Cs radioactive source calibration γ energy spectrum S 1 ,like figure 2 As shown, the highest point is at road address C 1 = 905, with C 1 Select the data with a width of 121 channels in the center of the bit, and use the peak shape fitting formula in a2 to fit. For the fitting results, see image 3 , get the peak fitting center track address The initial calibration results of energy E(C) and road site are obtained as follows:

[0095] E 1 (C)=0.732C

[0096] Obtained using the Mon-card simulation method 60 Cs radioactive source calibration γ energy spectrum S 2 ,like Figure ...

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Abstract

The invention discloses a method for gradually approximating a scale gamma energy spectrum high-energy region based on peak shape fitting. According to the method, a standard gamma source and gamma rays generated by neutron activation characteristic substances are gradually adopted for calibration; a simple energy spectrum is adopted to scale a low-energy section, then a low-energy section scale result is used to estimate a high-energy section peak position, a peak shape fitting method is adopted to determine a peak center, an energy scale range is continuously expanded, an interested high-energy section is gradually approached, and finally a channel address interval corresponding to the interested high-energy section is obtained. Compared with a traditional method that professionals recognize manual scales after multiple samples are activated at a time and complex gamma energy spectra are obtained, the method provides a set of self-adaptive processes and algorithms, automatic scale isachieved, the requirement for operators is reduced, and an application scene of neutron activation analysis is greatly expanded.

Description

technical field [0001] The invention belongs to the field of nuclear radiation detection, in particular to a method for gradually approximating the high-energy region of a scale gamma energy spectrum based on peak shape fitting. Background technique [0002] The neutron interrogation technology uses the neutrons emitted by the neutron generating device to react with the object to be detected, and emits instantaneous gamma rays. Generally, a scintillator gamma spectrometer is used to record the gamma ray energy spectrum, and the analysis of the energy spectrum determines the to-be-detected. information about the item. Due to the complex element composition of the object to be detected, the environmental background, etc., more γ-rays are generated by activation, and there are many mechanisms for γ-rays to interact with the detector material to deposit energy, and the obtained energy spectrum is very complex. Therefore, it is very important to find the characteristic peaks of ...

Claims

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Application Information

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IPC IPC(8): G01N23/222
CPCG01N23/222G01N2223/0745
Inventor 张迎增储诚胜许业文郭小峰曾军向清沛袁志文郝樊华向永春朱晨杨圣勤赵洪涛张海洋朱俊
Owner INST OF NUCLEAR PHYSICS & CHEM CHINA ACADEMY OF
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