Design of Fast Neutron Detector Irradiation Sample and Study of Its Temperature Characteristics
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摘要: 为实现核动力装置堆外快中子注量率监测的目的，开展了基于硫化锌（ZnS）闪烁体的小型化快中子探测器研制工作。为验证快中子探测器的耐中子辐照性能，结合辐照装置特性及辐照部件需求等开展了快中子探测器辐照样件设计，采用蒙特卡洛软件及COMSOL Multiphysics 5.5对基于ZnS闪烁体的快中子探测器内粒子输运及整体温度场分布进行了仿真模拟分析，并对探测器辐照样件进行迭代设计，完成了ZnS闪烁体的快中子探测器辐照样件设计。同时基于对仿真数据的深入分析，提取出各种材料在辐照场下的温度特征，为后续快中子探测器辐照样件加工制造及单个材料的辐照验证试验提供理论指导。Abstract: To achieve the purpose of monitoring the fast neutron fluence rate outside the nuclear power plant, the development of a miniaturized fast neutron detector based on zinc sulfide (ZnS) scintillator was carried out. To verify the neutron radiation resistance performance of the fast neutron detector, the radiation sample design of the fast neutron detector was carried out in combination with the characteristics of the irradiation device and the requirements of the irradiation components, and the Monte Carlo software and COMSOL Multiphysics 5.5 simulate and analyze the particle transport and overall temperature field distribution in a fast neutron detector based on zinc sulfide (ZnS) scintillator. The irradiation sample of the detector is designed iteratively, and the irradiation sample of the fast neutron detector of ZnS scintillator is designed. At the same time, based on the in-depth analysis of the simulation data, the temperature characteristics of various materials under the irradiation field are extracted, which provides theoretical guidance for the subsequent processing and manufacturing of fast neutron detector irradiation samples and the irradiation verification test of a single material.
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Key words:
- Scintillator /
- Fast neutron /
- Detector /
- Nuclear power plant /
- Reactor /
- Ex-core instrumentation system
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图 2 高含氢ZnS闪烁体晶体结构示意图
Figure 2. Schematic Diagram of Crystal Structure of High-Hydrogen ZnS Scintillator
图 3 快中子探测器辐照样件（方案1）模型
Figure 3. Model of Fast Neutron Detector Irradiation Sample (Scheme 1)
图 4 快中子探测器辐照样件（方案1）温度场
Figure 4. Temperature Field of Fast Neutron Detector Irradiation Sample (Scheme 1)
图 5 快中子探测器辐照样件（方案2）模型
Figure 5. Model of Fast Neutron Detector Irradiation Sample (Scheme 2)
图 6 快中子探测器辐照样件（方案2）温度场
Figure 6. Temperature Field of Fast Neutron Detector Irradiation Sample (Scheme 2)
图 7 快中子探测器辐照样件（方案3）模型
Figure 7. Model of Fast Neutron Detector Irradiation Sample (Scheme 3)
图 8 快中子探测器辐照样件（方案3）温度场
Figure 8. Temperature Field of Fast Neutron Detector Irradiation Sample (Scheme 3)
图 9 不同设计方案的ZnS闪烁体探头测温点的温度变化
Figure 9. Temperature Change of ZnS Scintillator Probe Temperature Measuring Point with Different Design Schemes
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