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Method for radionuclide identification by utilizing Compton scattering case statistics

A Compton scattering and radionuclide technology, applied in the field of radionuclide identification using Compton scattering case statistics, can solve the problem of asynchrony between radionuclide imaging and radionuclide identification, and achieve the effect of improving efficiency

Active Publication Date: 2020-11-03
INST OF HIGH ENERGY PHYSICS CHINESE ACADEMY OF SCI
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Problems solved by technology

[0004] In order to solve the problem that the nuclide imaging and nuclide identification of the Compton camera are not synchronized, the purpose of the present invention is to propose a method for radionuclide identification using Compton scattering event statistics, so as to realize the detection of unknown radioactive nuclides by the Compton camera. Quantitative identification of nuclides

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  • Method for radionuclide identification by utilizing Compton scattering case statistics
  • Method for radionuclide identification by utilizing Compton scattering case statistics
  • Method for radionuclide identification by utilizing Compton scattering case statistics

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Embodiment Construction

[0030] The invention proposes a method for identifying radionuclides by using statistics of Compton scattering events to realize quantitative identification of unknown radionuclides by a Compton camera. This method first utilizes the statistical array characteristics of the Compton scattering events determined by the Compton camera to measure and generate the nuclide library to be identified by the Compton camera; Statistical array of Su-Compton scattering events, according to the maximum likelihood expectation maximization method to obtain the species of the nuclide to be measured and the quantitative component ratio.

[0031] In this embodiment, a Compton camera with a double-layer detector structure is taken as an example, and the present invention will be further described below in conjunction with the accompanying drawings.

[0032] Step S1: According to the energy resolution of the Compton camera, the range of the scattering energy spectrum, and the imaging structure, et...

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Abstract

The invention discloses a method for radionuclide identification by utilizing Compton scattering case statistics. The method comprises the following steps: 1) measuring and generating a nuclide library to be identified of target equipment by utilizing the characteristics of a Compton scattering case statistical array determined by the target equipment, wherein the target device is a device capableof obtaining Compton scattering cases; 2) testing unknown nuclide contained in the to-be-identified nuclide library by utilizing the target equipment to obtain a to-be-tested Compton scattering casestatistical array; 3) calculating the probability density vi of the counting rate of each element i in the to-be-tested Compton scattering case statistical array relative to the multiple of the background condition; 4) obtaining the type and quantitative component rate of the nuclide to be measured according to a maximum likelihood expectation maximization method. According to the invention, quantitative identification of unknown radionuclides by the Compton camera can be realized.

Description

technical field [0001] The invention belongs to the field of nuclear radiation detection and nuclear technology application, in particular to a method for identifying radionuclides by using statistics of Compton scattering events. Background technique [0002] Today, with the vigorous development of nuclear science and technology, the qualitative identification and quantitative determination of radionuclides is one of the core tasks of nuclear radiation detection. Gamma spectrometers, gamma cameras and other equipment with the function of identifying radionuclides play an important role in the fields of arms control verification, nuclear facility monitoring, nuclear security inspection and nuclear emergency response. The method of radionuclide identification has always been a research hotspot in the field of gamma energy spectroscopy and gamma imaging. The main principle is to use the gamma energy spectra of different radionuclides to have different characteristic peaks. , ...

Claims

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Application Information

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IPC IPC(8): G01T1/167G01T1/36G06F17/10
CPCG01T1/167G01T1/36G06F17/10
Inventor 张济鹏李春苗孔令钦帅磊章志明魏龙
Owner INST OF HIGH ENERGY PHYSICS CHINESE ACADEMY OF SCI
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