光电倍增管倍增极信号定时性能的研究  

Timing characteristic of photomultiplier studied on dynode signals

作　　者：李道武[1] 章志明[2] 王宝义[2] 马创新[2] 魏龙[2] 张天保[2] 白立新[1] 

机构地区：[1]四川大学物理科学与工程技术学院,四川成都610064 [2]中国科学院高能物理研究所核分析技术重点实验室,北京100049

出　　处：《核电子学与探测技术》2005年第3期257-258,245,共3页Nuclear Electronics & Detection Technology

基　　金：国家自然科学基金(10275077和10475096)的资助

摘　　要：介绍一种从光电倍增管倍增极引出快信号的电路。分析了信号的产生机理,研究了它的定时性能。使用两支PhilipsXP2020Q光电倍增管,与BaF2闪烁体组成时间谱仪探头,从D9倍增极引出快信号,在使用Ortec935恒比定时和Ortec567时幅转换的条件下,测量60Co的瞬发时间谱,在2∶1能窗下得到FWHM=138ps的时间分辨。表明,此方法明显改善了谱仪的时间分辨性能。A circuit for taking out timing signal from one dynode of photomultiplier is described. The generation of dynode signal is analyzed and its timing characteristic is studied. This type of positron lifetime spectrometer consists of a pair of BaF_2 scintillators coupled to photomultipliers XP2020Q and related electronics, which is a fast-slow coincidence system using ORTEC 935 CFD, ORTEC 567 TAC modules. The best timing resolution recorded at 2∶1 energy window by ()^(60)Co is 138 ps in the way of the fast timing signal is taken from dynode 9. It improves the timing resolution of spectrometer very much in comparing with conventional methods.

关 键 词：光电倍增管 定时性能 信号 PHILIPS ^60CO 产生机理 恒比定时 时间分辨 分辨性能 体组成 时间谱 谱仪 

分 类 号：TN152[电子电信—物理电子学] TN919.34