数字电荷比较法优选新型塑闪探测器n-γ甄别性能  

Optimization of the n-γ Discrimination for Novel Plastic Scintillator Detectors Based on Digital Charge Comparison Method

作　　者：徐文韬 李永明[3] 阮念寿 宋志浩 田立朝 王尚武[1] XU Wen-tao;LI Yong-ming;RUAN Nian-shou;SONG Zhi-haob;TIAN Li-chao;WANG Shang-wu(College of Liberal Arts and Sciences,National University of Defense Technology,Changsha 410073,China;Key Laboratory for Surface Physics and Chemistry, Mianyang Sichuan 621907, China;Institute of MaterialsChina Academy of Engineering Physics,Mianyang Sichuan 621907,China)

机构地区：[1]国防科技大学文理学院,长沙410073 [2]表面物理与化学重点实验室,四川绵阳621907 [3]中国工程物理研究院材料研究所,四川绵阳621907

出　　处：《核电子学与探测技术》2018年第6期753-758,共6页Nuclear Electronics & Detection Technology

基　　金：中国工程物理研究院材料研究所特聘人才基金(TP201302-6)资助

摘　　要：基于信号数字化获取与处理技术,对新型塑闪探测器开展电荷比较法脉冲形状甄别优化研究,考察了不同的积分长窗和短窗、能量阈值、数字化仪的水平和垂直采样精度对甄別品质因子的影响,并在对脉冲平均波形函数拟合的基础上,计算了平均中子与γ脉冲尾部积分与长窗积分比例之差随长窗和短窗的变化趋势。结果表明:当积分短窗取35-50ns,积分长窗为450ns时,探测器n-γ甄别效果最好;在能量阈值范围为100-500keV内DT5730B数字化仪的甄别性能均较DT5751优异。以上结论可为新型探测器在n-γ混合辐射场的应用提供参考。Based on the digital pulses acquisition and processing technology, the optimization research on the n-γ discrimination for novel plastic scintillator detector by charge comparison method was presented. The influences of integral long gates and short gates 、horizontal and vertical sampling precision of digitizers and equivalent electron energy thresholds on the figure of merit ( FoM) parameters were investigated, also with the fitting functions of average pulses, the ratios of the tail integration to the long gate integration for neutron and gamma rays were calculated. The results showed that optimal integral short gate range was 35~50 ns and 450 ns for the long gate;and the PSD capabilities of DT5730B are better than DT5751 with a threshold range of 100-500 keV. It could provide a helpful reference for the applications of detectors to the neutron -gamma mixed radiation measurement.

关 键 词：塑闪探测器 n-γ甄别 电荷比较法 性能优化 

分 类 号：TL816.3[核科学技术—核技术及应用]