反符合法测量^152Eu放射性溶液的活度  

Activity Standardization of ^(152)Eu by Anti-coincidence Method

作　　者：杨丽艳[1] 汪建清[2] 姚顺和[2] 杨巧玲[2] 陈细林[2] 姚艳玲[2] 贾雪文[2] 张一云[1] 

机构地区：[1]四川大学物理科学与技术学院,四川成都610064 [2]中国原子能科学研究院放射性计量测试部,北京102413

出　　处：《原子能科学技术》2008年第4期296-299,共4页Atomic Energy Science and Technology

摘　　要：152Eu的衰变纲图复杂,包括72.1%的EC衰变和27.9%的β-衰变,衰变子体退激过程中又放出140多条γ射线,其中,12条能量处在122~1 408 keV之间,是主要γ射线1。52Eu常用于HPGeγ谱仪能量校准和效率校准等,152Eu的放射性活度准确测量极为重要。本工作利用4πβ(PPC)-γ(HPGe)反符合测量装置对152Eu的活度进行绝对测量,并与4π-β4πγ符合效率外推法和HPGeγ谱仪、4πγ高气压电离室测量的结果进行了比较。这几种方法的测量结果在不确定度范围内一致。^152Eu has a complex decay scheme, which decays 27.9% by β- emission and 72.1% by electron capture. The nuclide emits more than 140 γ-rays which include 12 main γ-rays in the range of 122-1408 keV. ^152Eu is an important radionuclide for the energy and efficiency calibration of the HPGe gamma-spectrometers. It is very important to study the absolute measurement methods of the activity. A solution of ^152Eu was absolutely standardized by the 4πβ（PPC）-γ（HPGe） anti-coincidence counting system and the results were compared with that by 4πβ-4πγ coincidence counting efficiency extrapolation, HPGe gamma-spectrometer and 4πγ high pressurized ionization chamber. It is shown that all the results from the above methods are in good agreements within the uncertainties.

关 键 词：4πβ(PPC)-γ(HPGe)反符合法 ^152Eu 活度 

分 类 号：TL84[核科学技术—核技术及应用]