测量反应堆快中子注量率的电流型宽禁带半导体探测器设计
Design of Current Mode Wide-band Semicondutor Detector for Reactor Fast Neutron Fluence Rate Measurement
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摘要: 为解决强流混合场快中子注量率实时测量的难题，本文基于反冲质子法，以耐辐照性能强、噪声低的半绝缘型（SI）GaN半导体材料为基础，采用带石墨平衡体及聚乙烯转换靶的并联结构，设计补偿式电流型探测器的方案，有效地降低了γ射线灵敏度。利用该探测器测量了西安脉冲堆1#径向孔道内混合场的快中子注量率，其结果与已有测量结果符合较好，验证了该方案的可行性。Abstract: In order to solve the problem of fast neutron fluence rate real-time measurement in intense neutron-gamma mixed field, a new neutron fluence rate measurement scheme based on recoil proton method and semi-insulating (SI) GaN detector was proposed. The compensation current parallel structure with graphite balancer and polyethyene converting target for fast neutron fluence rate detection, which effectively reduced the interference of γ ray and improved detection sensitivity of neutron radiation, was used in this scheme. This fast neutron fluence rate measurement scheme was implemented in the mixed field of Xi’an Pulsed Reactor 1# radial channel, and the results show consistency with previous measurement results and the validity of the scheme.
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