High-sensitivity thermal neutron detector

A high-sensitivity, thermal neutron technology, used in the measurement of scintillation detectors, etc., can solve the problems of low spatial resolution and low detection efficiency, and achieve the effects of fast time response, improved detection sensitivity, and improved detection efficiency.

Active Publication Date: 2020-12-11
INST OF HIGH ENERGY PHYSICS CHINESE ACAD OF SCI
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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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Embodiment Construction

[0041] Preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of the application and together with the embodiments of the present invention are used to explain the principle of the present invention and are not intended to limit the scope of the present invention.

[0042] A specific embodiment of the invention discloses a high-sensitivity thermal neutron detector. Such as figure 1 As shown, it includes a neutron converter, a SiPM array imaging system 3 and a processor. in, figure 1 Processor not shown.

[0043] Specifically, the neutron converter includes a Gd metal layer 1 and a Schombus optical fiber array 2 that is in close contact with the Gd metal layer. Among them, the Gd metal layer is used to receive the thermal neutrons emitted after irradiating the sample to be tested, and undergo a nuclear reaction with it to generate internal conversion e...

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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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01T3/06
CPCG01T3/06
Inventor 黄永盛吕军光孙希磊雒涛
Owner INST OF HIGH ENERGY PHYSICS CHINESE ACAD OF SCI
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