Energy spectrum analysis method for large-size samples

Abstract

The invention relates to an energy spectrum analysis method for large-size samples. Based on an instantaneous gamma-ray neutron activation analysis technique, gamma energy spectra are obtained by a scintillator detector. The obtained gamma energy spectra are subjected to neutron self-shielding correction treatment according to the element nonlinear response. The gamma energy spectra are analyzed by a least square method, single element response energy spectra are obtained, a single element spectral library is established, and nuclides in the samples can be identified and analyzed by the singleelement spectral library. Aiming at the defect that other spectral library analysis methods require a large number of samples, the single element spectral library which is not affected by backgroundelements is obtained by a few of calibrated samples based on a physical mechanism of the influence of multielement components on PGNAA analysis results. The measured energy spectra can be fitted directly by the single element spectral library, and the fast and accurate analysis of the nuclides in complex samples having multiple components and different reaction cross sections can be achieved.

Description

technical field [0001] The invention relates to the field of gamma energy spectrum analysis, in particular to an energy spectrum analysis method for large-volume samples. Background technique [0002] At present, in the field of measurement and analysis, PGNAA has become a routine analysis and detection technology. It has many advantages that other analysis techniques do not have, including high penetration, non-destructive, on-line in-situ measurement, and high analysis accuracy. Based on its unique advantages, it has been widely used in various fields such as social security, industry, environment, and medicine in recent years. The principle of PGNAA technology is to use neutrons to bombard the target nucleus of the material to be tested, and through thermal neutron capture, inelastic scattering and other reactions in a very short time (less than 10 -13 s) Emitting characteristic gamma rays, by detecting characteristic gamma rays and measuring the intensity of characteri...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the inadequacies of the current gamma spectrum analysis method, such as cumbersome and complicated, through neutron self-shielding correction, transform the nonlinear problem between the element content and the characteristic response into a linear problem, and invert the single element response spectrum, Build a single element response library

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