EJ339A俘获门控中子探测器双脉冲特性  

Double pulse waveform spectrum of EJ339A capture-gated neutron detector

作　　者：常乐[1,2] 刘龙祥[2,3] 王宏伟[2,3] 马春旺[1] 曹喜光[2,3] 张国强[2,3] 刘应都[2,4] 

机构地区：[1]河南师范大学物理与电子工程学院,新乡453007 [2]中国科学院上海应用物理研究所嘉定园区,上海201800 [3]中国科学院核辐射与核能技术重点实验室,上海201800 [4]中国科学院大学,北京100049

出　　处：《核技术》2015年第5期56-61,共6页Nuclear Techniques

基　　金：中国科学院战略性先导科技专项项目(No.XDA02010100);国家自然科学基金(No.11075195;No.11475245);国家自然科学基金青年项目(No.11305239);上海市粒子物理与宇宙学重点实验室开放基金课题(No.11DZ2260700);中国博士后科学基金项目(No.2012M520958)资助

摘　　要：实验研究了俘获门控中子探测器EJ339A的双脉冲波形特性,利用波形采样器进行波形记录,分析双脉冲时间差和PSD(Pulse Shape Discrimination)脉冲形状甄别和脉冲幅度谱。实验测量了EJ339A探测器中子俘获时间约为0.44μs,同经验公式计算结果一致。数据分析表明,EJ339A俘获门控中子探测器对中子及伽玛射线的PSD甄别能力要弱于EJ301常规液闪探测器;通过分析PSD谱开窗后的中子和伽玛能谱,发现EJ339A能够分析n-p反冲脉冲和中子俘获脉冲的关联特性及入射中子能量信息,EJ339A探测器的中子探测效率和双脉冲测量效率较低。Background： Capture-gated neutron detector has been doped by the higher thermal cross section elements, such as 6Li, μB or natGd, for a fast neutron incident detector signal with n-p recoil impulse and pulse neutron capture associated characteristics. Purpose： The aim is to study the double pulse waveform spectra and to analyze the n-p recoil impulse of the EJ339A capture-gated neutron detector. Methods： Through the analysis of energy spectra and the double pulse waveform spectra, the characteristics of EJ339A capture-gated detector are studied. Results： Capture-gated detector from the energy spectra and PSD spectra measurement is effective for neutron and gamma ray. The wave of digital technology could well analyze the n-p recoil impulse and give the τ value of the EJ339A in the experiment. Conclusion： EJ339A really has captrred-gated detector characteristics, pulse neutron capture and n-p associated characteristics of recoil impulse. The capture time of EJ339A is 0.44 μs, which is consistent with the theoretical calculation results.

关 键 词：俘获门控 闪烁体探测器 EJ339A 中子 

分 类 号：TL812.2[核科学技术—核技术及应用] TL816.3