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Gamma-ray energy spectrum full-energy peak base fine calculation method and system

A computing method and computing system technology, applied in the field of radiation detection, can solve problems such as indistinguishability, and achieve the effect of improving accuracy

Pending Publication Date: 2019-07-19
CHINA INST FOR RADIATION PROTECTION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

All-energy peak net counts are superimposed with basal counts in measured gamma spectra and cannot be distinguished from total counts

Method used

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  • Gamma-ray energy spectrum full-energy peak base fine calculation method and system
  • Gamma-ray energy spectrum full-energy peak base fine calculation method and system
  • Gamma-ray energy spectrum full-energy peak base fine calculation method and system

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Experimental program
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Effect test

Embodiment 1

[0073] like image 3 As shown, a refined calculation method for the full-energy peak base of the γ-ray energy spectrum, including:

[0074] S1. Obtain the recursive relationship between two adjacent substrates in the all-energy peak region based on the gamma energy spectrum with the track address of 1 to N:

[0075] B i -B i+1 =λP i i=0,...,N (1)

[0076] Among them, B i , B i+1 are the base counts of the i-th track and the i+1-th track, respectively; P i is the total energy peak net count of the i-th channel; Y i is the total count of the i-th channel; λ is an undetermined constant; N is a positive integer.

[0077] S2. Based on the identity that the total count is the sum of the net count of the all-energy peak and the base count, combined with the recursive relational expression, calculate the net count and the base count of each channel in the all-energy peak area.

[0078] The total count is the sum of the all-energy peak net count and the basal count, i.e.

[...

Embodiment 2

[0094] like Figure 4 As shown, a measured one containing 57 The gamma energy spectrum of a sample of Co nuclide (with known activity), assuming that the track range of a certain all-energy peak is 1 to N (determined according to the energy of gamma rays and the broadening of the all-energy peak), the total count of each track in this range is Y i (i=1,...,N), the count of the adjacent track outside the left and right boundaries is B L and B R (It can be the count of a single channel, or the average count of multiple adjacent channels), then the base count of each channel within the range of the all-energy peak can be calculated as follows:

[0095] 1) Assume that the net count of all-energy peaks in each channel is P i (i=1,..,N), construct the following vectors and matrices:

[0096]

[0097] Where λ is the parameter to be sought.

[0098] 2) Carry out the following iterative calculation:

[0099] (i) Take any initial value lambda 0 , M 0 , and set the maximu...

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Abstract

The invention discloses a gamma-ray energy spectrum full-energy peak base fine calculation method and system. The method comprises the steps of: S1, acquiring a recurrence relation expression betweentwo adjacent bases in a full-energy peak region in a gamma energy spectrum, of which a channel address is within a range of 1 to N; and S2, on the basis of an identical equation that a total count isthe sum of a full-energy peak net count and a base count, by combining the recurrence relation expression, calculating a net count of each channel of the full-energy peak region and the base count. According to the method and system provided by the invention, on the basis of the identical equation that the total count is the sum of the full-energy peak net count and the base count, an existing gamma energy spectrum full-energy peak base deduction method is improved, so that the deducted bases are more coincided with an actual condition, thereby improving gamma energy spectrum analysis accuracy.

Description

technical field [0001] The invention relates to the technical field of radiation detection, in particular to a refined calculation method and system for the full-energy peak base of gamma-ray energy spectrum. Background technique [0002] The gamma energy spectrum is a statistical distribution map of the signal counts formed by the energy deposition of the gamma rays emitted by the radionuclide in the detector according to the signal amplitude. Since the signal amplitude is proportional to the energy deposited by the gamma ray in the detector, the gamma energy spectrum is also the statistical distribution map of gamma ray counts according to energy. The profile is discrete, and its abscissa is the energy interval, or "Tao". Each track is usually labeled with a natural number, and this label is called "track address", that is, the address of the track. Gamma energy spectrum analysis is an important way to know the type and content of radioactive substances in the sample, an...

Claims

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Application Information

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IPC IPC(8): G01T1/36G06F17/12
CPCG01T1/36G06F17/12
Inventor 刘立业赵日肖运实曹勤剑汪屿金成赫赵原夏三强卫晓峰潘红娟李晓敦刘一聪熊万春
Owner CHINA INST FOR RADIATION PROTECTION