Research on Wide Energy Spectrum Neutron Detection Technology Based on 6LiF/ZnS(Ag) and Scintillating Fiber
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摘要: 为了解决传统中子探测器在狭窄空间、强电磁干扰、远距离传输等复杂环境下探测中子时存在的不足，本研究将6LiF/ZnS(Ag)混合材料和闪烁光纤相结合，设计了一种可用于宽能谱中子测量的新型闪烁体光纤中子探测器。基于蒙特卡罗粒子输运计算程序FLUKA对该新型光纤中子探测器的中子探测性能进行了模拟研究，完成了闪烁体光纤探头的优化设计。结果表明，当入射中子的能量在0.01~10 eV和0.5~10 MeV范围时，该新型中子探测器具有较高的中子探测效率，可用于热中子-快中子宽能谱范围中子的探测；通过对比脉冲幅度的差异，该新型中子探测器能够实现n-γ信号的甄别。
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关键词:
- 6LiF/ZnS(Ag) /
- 闪烁光纤 /
- 探测效率 /
- n-γ甄别 /
- FLUKA
Abstract: To solve the shortcomings of traditional neutron detectors in neutron detection in complex environments such as narrow space, strong electromagnetic interference, and long-distance transmission, this study combines 6LiF/ZnS(Ag) mixed materials and scintillating fiber to design a new type of scintillator fiber neutron detector that can be used for wide energy spectrum neutron measurement. Based on the FLUKA software, the neutron detection performance of the new fiber neutron detector was simulated and the optimization design of the scintillator fiber probe was completed. The results show that when the energy of the incident neutron is 0.01~10eV and 0.5~10MeV, the new neutron detector has a high neutron detection efficiency, it can detect the neutron in the wide spectrum of thermal neutron and fast neutron. In addition, by comparing the difference in pulse amplitude, the new neutron detector can realize the discrimination of n-γ signals.-
Key words:
- 6LiF/ZnS(Ag) /
- Scintillating fiber /
- Detection efficiency /
- n-γ discrimination /
- FLUKA
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图 2 不同6LiF/ZnS(Ag)质量比下ZnS(Ag)中的能量沉积
Figure 2. Energy Deposition in ZnS(Ag) of Different 6LiF/ZnS(Ag) Mass Ratio
图 3 不同6LiF/ZnS(Ag)涂层厚度下的中子转化效率
Figure 3. Neutron Conversion Efficiency of Different 6LiF/ZnS(Ag) Coating Thicknesses
图 5 不同入射中子能量下的探测效率
Figure 5. Detection Efficiency under Different Incident Neutron Energies
表 1 BCF-12光纤的主要参数
Table 1. Main Parameters of BCF-12 Fiber
参数名 参数值 芯层材料 聚苯乙烯 光纤直径/cm 0.025~0.500 芯层折射率 1.60 光产额/MeV−1 ~8000 衰减时间/ns 3.2 最大释放波长/nm 435 
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