CdZnTe个人剂量计能响特性的Monte Carlo模拟  

Monte Carlo simulations of the energy response of γ-ray dosimeters with CdZnTe semiconductor detectors

作　　者：康玺[1] 李君利[1] 曾志[1] 武祯[1] 

机构地区：[1]清华大学工程物理系,北京100084

出　　处：《清华大学学报（自然科学版）》2007年第z1期1005-1008,共4页Journal of Tsinghua University(Science and Technology)

基　　金：国家自然科学基金资助项目(10575065)

摘　　要：为了获得合适的CdZnTe(CZT)个人剂量计的剂量-能量响应补偿方案,利用Monte Carlo程序MCNP4C对CZT、CZT加各种补偿物质和CZT在不同电子学下阀的剂量-能量响应特性进行了模拟计算。通过模拟得到了2种CZT个人剂量计剂量补偿方案:在CZT(5mm×5mm×5mm)前加15mm Pb(带有阶梯孔)和2mm Pb(带有孔面积为Pb截面面积3%的孔,并分高、低能两能量道计数)。为今后的CZT个人剂量计设计提供了理论依据。A method was developed to compensate for the energy response of gamma-ray dosimeters with CdZnTe(CZT) semiconductor detectors by analyzing the energy response of different detector sizes,various shielding materials,and various electronic thresholds with MCNP4C.The simulations show that a 15 mm thick Pb shield with 12.5% holes placed before the CZT(5 mm×5 mm×5 mm) detector or a 2 mm thick Pb shield with 3% holes before the detector and counting in two energy channels provide effective energy response compensation.The results provide a theoretical guide for the further design of CZT dosimeter.

关 键 词：个人剂量计 能量响应 CDZNTE MONTE CARLO方法 

分 类 号：TL818[核科学技术—核技术及应用]