Conversion layer for improving neutron detection efficiency
A technology of detection efficiency and conversion layer, applied in the field of conversion layer to improve neutron detection efficiency, can solve problems such as low neutron detection efficiency, and achieve the effect of improving detection efficiency
Active Publication Date: 2021-09-24
CHONGQING JIANAN INSTR
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[0004] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a conversion layer that improves the neutron detection efficiency, so as to solve the problem of low neutron detection efficiency in the prior art
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[0018] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0019] 1. A conversion layer that improves neutron detection efficiency
[0020] At present, the conversion layer with a flat surface is used in the prior art. When the incident neutron flux is constant, the integral yield of recoil protons is related to the thickness of the flat conversion layer. From figure 1 It can be seen that the recoil proton yield initially increases with the increase of the conversion layer thickness, reaches a maximum after reaching a certain thickness, and then slowly decreases with the increase of the conversion layer thickness. Through research, it is found that the reason for this phenomenon is that after the thickness increases to a certain value, some recoil protons lose energy in the conversion layer and cannot fly out of the conversion layer. The present invention finds through research that changing the structure of ...
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The invention discloses a conversion layer for improving neutron detection efficiency, which comprises an incident layer and an emergent layer, and the incident layer is of a planar structure, and the emergent layer is a plurality of conical bosses which are uniformly distributed on one side surface, deviating from an incident surface, of the incident layer; the center line of the boss is perpendicular to the plane where the incident layer is located; and the conversion layer is made of a polymer material containing a hydrogen element. According to the invention, the surface of the emergent layer of the conversion layer is provided with a plurality of conical bosses which are uniformly distributed, the effective area for emergent recoil protons on the conversion layer is increased through the conical bosses, protons which cannot penetrate out originally can penetrate through the conversion layer to fly out now, the detection efficiency of the detector on neutrons is greatly improved, and the resolution capability of the neutron position sensitive detector on the neutron position is not reduced.
Description
technical field [0001] The invention relates to the technical field of neutron detection, in particular to a conversion layer for improving neutron detection efficiency. Background technique [0002] Neutron detection is the measurement of the number and energy of neutrons. The detection of neutrons is required in the utilization of nuclear energy, the generation of radioactive isotopes, and the research of applied nuclear physics. However, neutrons are not charged, will not cause ionization, and do not produce direct observable effects. Therefore, the detection of neutrons It is through the interaction of neutrons and nuclei to detect the products of the reaction. There are four main methods of neutron detection: nuclear recoil method, nuclear reaction method, nuclear fission method and activation method. Among them, the detection of neutrons can be realized by using elastic scattering of neutrons and hydrogen-containing materials to produce recoil protons. According to t...
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Login to View More IPC IPC(8): G01T3/08
CPCG01T3/08Y02E30/30
Inventor 赵鑫周睿吴瑶姚克义
Owner CHONGQING JIANAN INSTR