A Gaussian response matrix based nai(ti) scintillation detector gamma spectrum high-resolution inversion analysis system and method

Abstract

The invention relates to an NaI (TI) scintillation detector gamma energy spectrum high-resolution inversion analysis process and method based on a gauss response matrix. The analysis process comprises the steps of spectral line pretreatment, peak searching and peak boundary treatment, resolution ratio ruling, background subtraction, gauss response matrix generation and inversion analysis. According to the feature of an NaI (TI) scintillation detector and the physical property of the spectrum forming process, response, in the detector, of different energy gamma photons corresponds to different full widths at half maximum of a photo peak, and the photo peak is approximate to a gauss function in shape. The parameters of the full widths at half maximum of a spectral line are extracted, the background is subtracted from the full widths at half maximum adaptively, the universal gauss response matrix between a radioactive source and a gamma spectrum is constructed, and finally the response matrix is used for inversion analysis of other gamma instrument spectrums measured by the NaI (TI) scintillation detector. The result analyzed through the method is an energy point corresponding to the measured spectral line under the response matrix or is approximate to the solution of a physical spectral line in theory, and the ability of the method to analyze the spectral line is obviously improved.

Description

technical field [0001] The invention relates to the technical field of gamma instrument spectrum analysis, in particular to a Gaussian response matrix-based NaI(TI) scintillation detector gamma energy spectrum high-resolution inversion analysis process and method. Background technique [0002] The detection of gamma rays mainly depends on the interaction between gamma photons and matter, and transfers all or part of the photon energy to the electrons in the detector medium. The maximum energy of the electrons is equal to or proportional to the energy of the incident gamma photons. proportional to , and will slow down in the detector and lose its energy in the same way as any other type of fast electron, such as a beta particle. Therefore, gamma-ray energy measurements are made by recording the energy deposited in the detector. Obviously, the gamma energy spectral distribution obtained by using the gamma energy spectrometer is different from the original gamma ray spectral d...

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Problems solved by technology

[0004] Aiming at the problem that the energy resolution of NaI(Tl) scintillation detector is low, which leads to complex extraction of spectral parameters in gamma energy spectrum measurement, the present invention provides a Gaussian response matrix-based NaI(TI) scintillation detector gamma spectrum inversion analysis process and method, so as to achieve the goal of more accurate qualitative and quantitative analysis of radionuclides

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