High-sensitivity thermal neutron detector

Abstract

The invention relates to a high-sensitivity thermal neutron detector, belongs to the technical field of neutron detection imaging, and solves the problem of low detection efficiency of a thermal neutron detector in the prior art. The detector comprises: a neutron converter which comprises a Gd metal layer and a plastic flashing optical fiber array tightly connected with the Gd metal layer, the Gdmetal layer is used for receiving thermal neutrons emitted after irradiating a to-be-detected sample and generating nuclear reaction with the thermal neutrons to generate internal conversion electrons, and the internal conversion electrons penetrate through the Gd metal layer to enter the plastic flashing optical fiber array; wherein the flashing optical fiber array is used for transmitting visible light generated by the internal conversion electrons to the SiPM array imaging system; a SiPM array imaging system which is used for detecting visible light and obtaining a first detection image; and a processor which is used for processing the first detection image and the second detection image obtained when no to-be-detected sample exists to obtain an image carrying the information of the to-be-detected sample, wherein the detector has relatively high capture rate and conversion rate on thermal neutrons, so that the detection efficiency is improved, and the detector has relatively high spatial resolution.

Description

technical field [0001] The invention relates to the technical field of neutron detection and imaging, in particular to a high-sensitivity thermal neutron detector. Background technique [0002] Neutron detection occupies a special position in nuclear radiation detection technology. At present, the research on thermal neutron detectors at home and abroad is relatively extensive, and it has been applied in many fields and facilities, such as neutron scattering experiments, accelerators, reactors and outer space detection, etc., and the detection efficiency and Spatial resolution is the key technical point. [0003] In the prior art, a thermal neutron detector uses a conversion material to convert thermal neutrons for detection and imaging, and more conversion materials are He 3 Tube, because it reacts with thermal neutron cross section up to 5330bar. Except He 3 tube, and Li 6 , B 10 to convert materials. Among them, Li 6 The reaction cross section with thermal neutron...

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Problems solved by technology

[0005] In view of the above-mentioned analysis, the present invention aims to provide a high-sensitivity thermal neutron detector to solve the problem of low spatial resolution of existing thermal neutron detectors, The problem of low detection efficiency

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