超快中子探测器闪烁体性能计算  

Performance calculation of ultra fast neutron scintillator

作　　者：唐琦[1] 赵宗清[1] 苏明[1] 彭晓世[1] 

机构地区：[1]中国工程物理研究院激光聚变研究中心,四川绵阳621900

出　　处：《强激光与粒子束》2010年第6期1243-1246,共4页High Power Laser and Particle Beams

摘　　要：超快中子探测器是ICF聚变反应速率测量系统的核心部件。利用蒙特卡罗粒子输运工具包Geant4模拟了一种超快中子探测器——BC-422型闪烁探测器的中子探测过程,计算出了几种厚度的BC-422型闪烁体的探测效率、输出光信号强度和时间分辨力;对比了闪烁体的2种不同反射表面对输出光信号强度和时间分辨力的影响。计算的结果显示:设计适当的BC-422型闪烁探测器能够测量的最低中子产额在108量级,对DT中子的信号时间分辨力好于20 ps,对DD中子的信号时间分辨力达到30 ps,能够用于大型激光装置及其原型的聚变反应速率测量。The ultra fast neutron detector is the key device in ICF fusion reaction-rate measure system.The performance of the ultra fast neutron scintillator BC-422 was simulated using Geant4 code system.The detection efficiency,temporal resolution and signal intensity of BC-422 with different thickness were calculated.The temporal resolution and signal intensity of BC-422 cladded with two kinds of reflection surfaces were compared.The results show that the properly designed BC-422 scintillator can perform well above 108 neutron yield,and its temporal resolution is better than 20 ps for DT fusion neutron,and 30 ps for DD fusion neutron.The BC-422 scintillator is applicable to the fusion reaction-rate measure system for a large-scale laser facility and its prototype requiring tens of ps-scale temporal resolution.

关 键 词：核探测 聚变反应速率测量 塑料闪烁探测器 蒙特卡罗方法 超快时间分辨力 

分 类 号：TL816.3[核科学技术—核技术及应用] TL812.1