Liquid scintillator detector n/gamma ray screening method based on support vector machine

Abstract

The invention provides a liquid scintillator detector n / gamma ray screening method based on a support vector machine. The method includes the following steps that firstly, signals are collected, the signals generated by a neutron source are collected through a liquid scintillator detector, and the collected signals are transformed into pulse signals; secondly, neutrons and gamma rays are screened through a charge comparison method, the pulse signals obtained in the first step are screened through a traditional charge comparison method, and the lower limit of the screening energy of the neutrons and the gamma rays of the charge comparison method is determined; thirdly, an M matrix is obtained; fourthly, LIBSVM software is used for conducting classification forecasting on the neutrons and the gamma rays. The liquid scintillator detector n / gamma ray screening method can distinguish signals with energy below a screening threshold value in the traditional method, and therefore the accuracy of neutron flux measuring is easily improved.

Description

technical field [0001] The invention belongs to the technical field of neutron radiation detection, in particular to a liquid scintillator detector n / γ-ray screening method based on a support vector machine. Background technique [0002] In 1931, British physicist James Hadwick discovered the existence of neutrons (n). In the following decades, neutron detection technology has been extensively and deeply researched and applied. At present, neutron detection technology has been widely used in well logging, contraband detection, environmental radiation detection, medicine and military and other fields. However, due to the inelastic scattering of neutrons and the surrounding environment, the radiation capture of slowed neutrons, etc., the occasions where neutrons exist are almost always accompanied by a large amount of gamma-ray (γ-ray) background. It is also very sensitive. To accurately determine the neutron flux in the environment, the influence of gamma rays on neutron fl...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a liquid scintillator detector n / γ-ray screening method based on support vector machine for the indistinguishable deficiency of the existing technology in n / γ-ray screening that the energy is below the screening threshold. Method can help improve the accuracy of neutron flux measurements by distinguishing signals with energies below the discrimination threshold of traditional methods

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