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闪烁薄膜探测器的灵敏度和中子/γ分辨能力与闪烁晶体厚度密切相关,合理选择闪烁晶体厚度是探测器设计的关键。该文应用Monte Carlo方法模拟了中子和γ射线与闪烁晶体的相互作用过程,计算研究了晶体厚度对探测器灵敏度及中子/γ分辨能力的影响,给出了0.1~16.0MeV中子和γ射线照射下探测器的相对灵敏度,并结合部分能点的实验室标定数据,得到了探测器灵敏度能量响应曲线和中子/γ分辨率。理论计算的灵敏度能量响应曲线与实验标定趋势基本一致。
The sensitivity and neutron / γ resolving power of the scintillation film detector are closely related to the thickness of the scintillation crystal. A reasonable choice of scintillation crystal thickness is the key to the detector design. The Monte Carlo method is used to simulate the interaction between neutron and γ-ray with scintillation crystal. The effects of crystal thickness on detector sensitivity and neutron / γ resolution are studied. The relative sensitivity of the detector under γ-ray irradiation and the sensitivity calibration of the detector with neutron / γ resolution were obtained by combining the laboratory calibration data of some energy points. Theoretical calculation of the sensitivity of the energy response curve and experimental calibration trend is basically the same.