Statistics distributed gamma or X ray energy spectrum unscrambling method

An X-ray and distributed technology, applied in the field of statistical distributed gamma or X-ray energy spectrum analysis, can solve the problems of increased workload, insufficient fitting accuracy, and limited versatility of spectral analysis methods.

Inactive Publication Date: 2012-07-25
CHENGDU UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The energy spectrum broadening method in MCNP uses the parameter FWHM for fitting instead of the Gaussian full-energy peak standard deviation σ, so the fitting accuracy is not high enough. Broadening, and then performing spectrum analysis on the broadened analog spectrum, the same as the abo

Method used

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  • Statistics distributed gamma or X ray energy spectrum unscrambling method
  • Statistics distributed gamma or X ray energy spectrum unscrambling method
  • Statistics distributed gamma or X ray energy spectrum unscrambling method

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Embodiment 1

[0079] The detection of gamma or X-rays is based on the interaction between rays and matter, and the detection method is based on the atomic excitation or ionization process that occurs when charged particles pass through the detector. Both γ-ray and X-ray are a kind of electromagnetic radiation. Generally, the energy of γ-ray is higher than that of X-ray. When the ray interacts with the detection medium, photoelectric effect and scattering effect occur (for γ-ray greater than 1.02MeV, there is also a Electron pair effect), high-energy electrons are generated, and then under the action of an external electric field, the detection of rays is realized by recording the electrical signals formed by these electrons. The spectrum resolution algorithm implemented in the present invention is also based on the signals obtained by the detection system of high-purity germanium (High Purity Germanium, HPGe) semiconductor detector and Si (Li) semiconductor detector, figure 1 and figure 2...

Embodiment 2

[0130] The spectral solution method using the spectral line fraction is as follows:

[0131] When the same radionuclide undergoes γ or X decay, it emits rays with energy greater than or equal to one, and their energies are respectively expressed in E kt Indicates that t=1, 2, Λ, h, which emits rays of h kinds of energy, the ratio of the intensity of each energy ray to the total intensity of the ray is called the spectral line fraction, expressed as a percentage "%", when the measurement conditions are unchanged When , for the same radionuclide, the spectral fraction of each energy ray emitted by its decay remains unchanged, and the spectral fraction is obtained by calculating the peak area ratio, or by using the branch ratio of each energy.

[0132] The spectral line fraction obtained by using the peak area ratio is: where W j Obtained through steps (1)-(8).

[0133] For the case of one-sided overlap and double-overlap, suppose E k1 with E k2 One side overlap or double o...

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Abstract

The invention discloses a statistics distributed gamma or X ray energy spectrum unscrambling method which solves the problems of poor generality, large workload and poor precision of the traditional method. According to the invention, aiming at a Gaussian part in a gamma or X ray full-energy peak, a plurality of parameters with respective physical significances, which are obtained according to gamma or X ray detection characteristics are established, and solution processes of the parameters are illustrated. The statistics distributed gamma or X ray energy spectrum unscrambling method is technically characterized in that under the condition of stable or unchangeable simulation conditions of a gamma or X ray detector, the parameters are figured out once, and energy spectrum fitting can be carried out form a long time by using the parameters, so that the unscrambling realizing process is simplified and universalized, the defects of variable parameters and insufficient significance in the traditional energy spectrum fitting function or simulation energy spectrum widening function unscrambling method are avoided, and the analysis speed and the analysis precision of gamma or X ray energy spectrum analysis are improved.

Description

Technical field: [0001] The invention relates to a statistically distributed gamma or X-ray energy spectrum analysis method based on a normal distribution probability function in the process of nuclear radiation energy spectrum measurement and analysis. Background technique: [0002] When nuclear radiation detectors are used to measure the energy spectrum of γ or X-rays, it is common to see the phenomenon that the spectral peaks overlap each other. In order to obtain the information of γ or X-rays under a single energy in the measured γ or X-ray energy spectrum, the corresponding γ or The energy and intensity of X-rays must be analyzed by a certain spectrum resolution method to analyze the measured energy spectrum. [0003] For a long time, researchers at home and abroad have devoted themselves to the research of function fitting spectrum analysis methods, that is, using the least squares method or partial least squares method to perform function fitting on the measured poin...

Claims

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Application Information

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IPC IPC(8): G01T1/36
Inventor 李哲庹先国杨剑波刘明哲成毅王磊石睿
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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