高能γ光子CsI(Tl)谱仪的研究与设计  

Study and design on anti-coincidence high-energy γ photon spectrometer

作　　者：孙长春[1] 李家才[2] 姚淑德[1] 张亚伟[1] 张少平[2] 

机构地区：[1]北京大学技术物理系,北京100871 [2]中国科学院高能物理研究所,北京918信箱100039

出　　处：《核电子学与探测技术》2004年第4期376-378,358,共4页Nuclear Electronics & Detection Technology

基　　金：国家自然科学基金资助项目(1007504)

摘　　要：利用EGS4程序包模拟研究了6.6MeV的高能γ光子在CsI闪烁体中的运动行为,决定了探测这种能量γ光子所需CsI晶体的大小。根据模拟计算和实验的要求,设计了CsI(Tl)γ光子谱仪。用137Cs和22Na源对谱仪的测试表明,此探测器具有较好的探测效率,在0.662MeV的光电峰上可以达到74%。模拟计算对3.3和6.6MeV的光电峰可以分别达到37.12%和23.00%。In this paper, using EGS4 program code we have studied and simulated the transport of high energy γ with 6.6 MeV in the CsI crystal, decided the size of CsI crystal to detect such energyγphoton. According to the need of experiment and result of the simulation, finally we designed the anti-coincidence high-energyγphoton spectrometer. The measurements to this spectrometer by ^(137)Cs show that the efficiency of photoelectric peak at 0.662 MeV is about 74%. And the calculation shows that it is about 37.12% and 23.5% separately at 3.3 MeV, 6.6 MeV.

关 键 词：蒙特卡罗技术 γ光子 碘化铯晶体 Γ谱仪 反符合 探测效率 

分 类 号：TL817.2[核科学技术—核技术及应用]