4πβ-4πγ相加效率外推法测量^(60)Co、^(134)Cs活度  

Activity Measurement of ^(60)Co,^(134)Cs by Using 4πβ-4πγ Sum Efficiency Extrapolation Method

作　　者：郭晓清[1] 汪建清[1] 姚顺和[1] 

机构地区：[1]中国原子能科学研究院国防科工委放射性计量一级站,北京102413

出　　处：《原子能科学技术》2009年第4期300-303,共4页Atomic Energy Science and Technology

摘　　要：阐述了由4πβ(PC)流气式正比计数器及大体积井型4πγNaI(Tl)晶体组成的4π-β4πγ活度测量装置,从理论上建立了相加效率外推方程,并利用相加效率外推方法测量了60Co1、34Cs活度,其相对标准不确定度分别为0.29%、0.19%。将测量结果与符合效率外推测量结果进行了比较验证。分析表明,此方法适于复杂衰变核素的活度测量。A 4πβ-4πγ detector configuration with a 4πβ （PC） flow proportional counter and a large size well-type 4πγNaI（Tl） crystal was described, and the theoretic function of sum efficiency extrapolation was established. The radioactivities of ^60Co and ^134Cs source were measured using this sum extrapolation method, 0.29% and 0.19% relative uncertainty obtained for each, and the result was compared with the value of coincidence efficiency extrapolation. The analysis indicates this method is fit for measuring the activity of complex decay nuclides.

关 键 词：4πβ-4πγ装置 相加效率外推 60Co 134Cs 活度 

分 类 号：TL811.2[核科学技术—核技术及应用]