闪烁纤维中子探测器灵敏度研究

Study on Sensitivity for a Scintillating-fiber-array Neutron Detector

用蒙特卡罗方法研究了1种闪烁纤维中子探测器对不同能量中子和伽玛射线的相对灵敏度,并在实验室对几个能点的灵敏度进行了标定。实验结果表明:理论计算与实验标定的探测器能量响应曲线趋势基本一致,探测器对2 5MeV中子和1 25MeV伽玛射线的灵敏度比值为5 3。利用实验数据对计算值进行校正,可给出探测器能量响应全曲线。

The sensitivity for a scintillatingfiberarray ne ut ron detector is studied. The energy response of the detector to neutrons a nd gamma rays is simulated using MonteCarlo method. The calibration work is ca rried out at several specific energies as well. The results show that the tenden cy of the theoretical energy response curve is in good agreement with that from the experiment. By fitting the experiment data, the energy response of the detec tor in a wide energy range could be obtained. The detector's neutrontogamma sensitivity ratio is about 5.3 for the 2.5 MeV neutrons and 1.25 MeV gamma rays.