【作者】 杨雪梅； 周昌贵； 漆明森；

【Author】 YANG Xue-mei,ZHOU Chang-gui,QI Ming-sen (South-West Radioactive Metrology Department of Nuclear Industry,Chengdu of Sichuan Prov.610005,China)

【机构】 中国核动力研究设计院一所；

【摘要】 ¹³³Ba是一种复杂的电子俘获衰变核素,发射多支X,γ射线,对X,γ谱仪能量刻度和效率校准具有重要意义。用4πX（PPC）-γ符合测量标准装置测量了¹³³Ba放射性溶液比活度,简述了测量基本原理及测量结果,得到¹³³Ba比活度为450.7（1±0.26%）kBq·g^-1。用4πβ（PC）-γ符合测量装置对¹³³Ba同一批样品进行了验证测量,结果为445.1（1±0.64%）kBq·g^-1。将两套装置测量结果与国防科工委放射性计量一级站的测量结果进行比较,得出4πX（PPC）-γ符合测量结果与三者测量结果平均值的相对偏差为0.4%。对4πX（PPC）-γ符合法测量结果的不确定度进行了评定,得出扩展不确定度为1.2%（k=2）。更多还原

【Abstract】 ¹³³Ba,a complex electron capture decay nuclide,emits several X andγrays,plays a significant role in the energy calibration and efficiency calibration of X,γspectrometer.The specific activity of ¹³³Ba radioactive solution was measured by 4πX（PPC）-γcoincidence measurement standard apparatus.The measurement principle and measurement results are briefly described in the paper.The specific activity measurement result for ¹³³Ba is 450.7（1±0.26%） kBq·g^-1.In order to verify the measurement result,using the 4πβ（PC）-γcoincidence measurement standard apparatus measure the same ¹³³Ba samples, and the result for ¹³³Ba is 445.1（1±0.64%） kBq·g^-1.Compared the measurement results from the two apparatus with the Radio metrology first level station of CSTIN,the relative deviation of the measurement result by 4πX（PPC）-γand the three measurement results mean value is 0.4%.The uncertainty of the 4πX（PPC） -γcoincidence measurement result is assessed, and the extend uncertainty is 1.2%（k=2）.更多还原