Neutron energy spectrum measuring device and measuring method thereof

Abstract

The invention discloses a neutron energy spectrum measurement device and a measurement method thereof. A neutron gamma ray information conversion device of the neutron energy spectrum measurement device comprises a thermal neutron capture material, a fast neutron moderator, a fast neutron inelastic scattering material and a high-energy neutron multiplication material which are of a concentric sphere structure, wherein the central gamma detector is arranged in the center of the concentric sphere, the multilayer thermal neutron capture material, the single-layer fast neutron moderator, the multilayer fast neutron inelastic scattering material and the single-layer high-energy neutron multiplication material sequentially wrap the central gamma detector from inside to outside, and the data acquisition and processing system is electrically connected with the central gamma detector. The device is advantaged in that instantaneous gamma rays generated by reaction of neutrons and various nuclides with different neutron reaction sections are detected through the central gamma detector, and a neutron energy spectrum is reversely deduced through the data acquisition and processing system by utilizing the energy and intensity of characteristic gamma rays and information of various nuclide materials, so detection efficiency of the system is effectively improved; and on-line measurement of theneutron energy spectrum in the wide energy region is realized.

Description

technical field [0001] The invention belongs to the technical field of radiation detection, and in particular relates to a neutron energy spectrum measurement device and a measurement method thereof. Background technique [0002] Neutron energy spectrum measurement is a basic research in neutron physics, which is of great significance to nuclear physics research. The measurement accuracy of traditional commonly used neutron spectroscopy measurement methods is generally not high and each has its own limitations. For example, the activated sheet measurement method has low cost and excellent n / γ discrimination ability, but most of the measurement results are Disadvantages such as relying on the initial spectrum and low energy resolution. The measurement method based on plastic scintillator or liquid scintillator is convenient to use, but the problems of n / γ discrimination and accurate response function acquisition must be solved. The development of commonly used gas detectors...

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Problems solved by technology

The measurement method based on plastic scintillator or liquid scintillator is easy to use, but it must solve the problems of n / γ discrimination and accurate response function acquisition

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