厚型气体倍增快中子探测器及γ射线抑制研究

摘要

In this paper , a new fast neutron detection based on THGEM has been designed .Through researching on its response of fast 252 Cf neutron source and 137 Csγsource, the measured results were obtained under 3 dif-ferent threshold of 80 mV, 160 mV, 260 mV, so as to get the feasible domain for detecting the recoil protons from n-p scattering with better γsuppression effect .The results show that under 260 mV regarding fast neu-tron of 2.13 MeV, the possible working voltage domain for complete γsuppression is approximately 70 V.%设计了一种基于厚气体电子倍增器（ THGEM）的快中子探测器。通过研究其对252 Cf快中子源（2．13 MeV）和137 Csγ源（661 keV）的响应，分别得到了在80 mV、160 mV、260 mV三种电子学阈值下，探测器对γ射线抑制和快中子探测的结果。结果表明在阈值为260 mV、γ射线全部抑制的条件下，探测器有70V的工作电压调整范围，能够探测到中子的（n，p）过程产生的反冲质子信号。