液体闪烁计数符合测量系统设计  

Design of Coincidence Measurement System for Liquid Scintillation Counting

作　　者：柳加成[1] 吴永乐[1] 杨斌[1] 岳会国[1] 韩善彪[1] LIU Jia-cheng;WU Yong-le;YANG Bin;YUE Hui-guo;HAN Shan-biao(Nuclear and Radiation Safety Center,Ministry of Environmental Protection,Beijing 100082,China)

机构地区：[1]环境保护部核与辐射安全中心

出　　处：《核电子学与探测技术》2019年第4期532-537,共6页Nuclear Electronics & Detection Technology

基　　金：国家重大科学仪器设备开发专项(2016YFF0103907)资助

摘　　要：为满足液体闪烁测量装置需求,设计了一套针对液体闪烁信号检测的符合测量系统。该系统包括4路12位采集通道,使用FPGA进行采集控制和数据传输,基于离线算法实现符合、α/β甄别、能谱分析等功能。使用α(241Am)和β(90Sr-90Y)淬灭样品进行了测试,测试结果表明,该系统α/β误甄别率分别为6.2%和5.6%,测量系统重复性为0.59%,稳定性为0.83%。According to the need of liquid scintillation counting device,a coincidence measurement system for liquid scintillation signal detection was designed.The coincidence measurement system includes 4 acquisition channels,with 12-bit.In the system,FPGA was used for acquisition control and data transmission.Off-line algorithm was studied to realize the functions of coincidence,alpha/beta discrimination and energy spectrum analysis.Performance test was conducted using α(241 Am)and β(90Sr-90Y)quenched samples.Results show that the spillover of alpha events to beta and beta events to alpha is 6.2% and 5.6%,the repeatability of the measurement system is 0.59%,and the stability of the measurement system is 0.83%.

关 键 词：液体闪烁计数 符合 脉冲波形甄别 

分 类 号：TL822[核科学技术—核技术及应用]