减小模板状NaI(Tl)探测器的边缘死区  

Reducing the unusable areas of modular NaI(Tl) detector

作　　者：李玉兰[1] 金永杰[1] 

机构地区：[1]清华大学工程物理系,北京100084

出　　处：《核电子学与探测技术》2000年第2期112-114,146,共4页Nuclear Electronics & Detection Technology

摘　　要：用在环状 SPECT系统中的 Na I(Tl)探测器模板存在着严重的边缘死区。介绍了一些减少该死区的办法 ,包括 :一个 PMT管跨接两个探测器模板 ,在边缘刻槽等等。实验结果证明通过这些处理 ,这个死区可以减小到This paper presents some methods to reduce the unusable areas at the edges of modular small plate NaI(Tl) crystals that are used in a cylindrical SPECT system. Generally the unusable area is about half the PMT's width. In our approach, the PMT at the edge is shared by two adjacent modules; and two grooves parallel to the edge, one on the entrance surface, the other on the exit surface were cut on crystal. Using the centroid algorithn to calculate the position, we found the intrinsic resolution could be reduced to 5 mm.

关 键 词：SPECT 边缘效应 光扩展函数 碘化钠内烁探测器 

分 类 号：TL812[核科学技术—核技术及应用]