摘要
采用4πβ(LS)-γ与4πβ(PC)-γ2种数字符合计数法对放射性核素^(131)I进行了活度测量,并对这2种方法得到的测量结果进行了不确定度评定。β道分别采用了以氩甲烷为工作气体的流气式正比计数器(PC)和制样简单的液体闪烁计数器(LSC)探测β射线。同时,运用可实现短寿命核素活度测量的数字符合计数法对β、γ脉冲序列文件进行离线处理,经过死时间修正和符合分辨时间修正后,给出用于效率外推的符合计数。结果表明,2种测量方法得到的^(131)I核素的比活度在不确定度范围内一致,相对标准偏差为0.27%。
Activity measurements of ^(131)I were performed by 4πβ(LS)-γand 4πβ(PC)-γdigital coincidence counting methods,respectively.And the uncertainty of the results obtained by the two methods were also evaluated.Theβ-ray was detected by a flow-gas proportional counter(PC)operated with a mixture of argon and methane as the working gas and a liquid scintillation counter(LSC)with simple sample preparation,respectively.After that,the digital coincidence counting technique which detects the short-lived nuclides appropriately was used to processed theβ、γlist mode file offline.The coincidence counts for efficiency extrapolation were given after dead time correction and coincidence resolution time correction.It shows that the results of ^(131)I obtained by the two methods are consistent in the range of uncertainty,and the relative standard deviation is 0.27%.
作者
罗丽峰
刘皓然
梁珺成
范富有
张明
徐强
LUO Li-feng;LIU Hao-ran;LIANG Jun-cheng;FAN Fu-you;ZHANG Ming;XU Qiang(College of Physics and Optoelectronics,Taiyuan University of Technology,Taiyuan,Shanxi 030024,China;National Institute of Metrology,Beijing 100029,China)
出处
《计量学报》
CSCD
北大核心
2023年第7期1128-1133,共6页
Acta Metrologica Sinica
基金
山西省基础研究面上项目(20210302123152)。
