两种符合计数方法测定<sup>131</sup>I核素活度

doi:10.3969/j.issn.1000-1158.2023.07.19

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摘要采用4πβ(LS)-γ与4πβ(PC)-γ 2种数字符合计数法对放射性核素¹³¹I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¹³¹I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%。

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	罗丽峰
	刘皓然
	梁珺成
	范富有
	张明
	徐强

关键词 ：计量学, ¹³¹I, 数字符合, 效率外推, 4πβ(LS)-γ, 4πβ(PC)-γ

Abstract：Activity measurements of ¹³¹I were performed by 4πβ(LS)-γ and 4πβ(PC)-γ digital coincidence counting methods, respectively. And the uncertainty of the results obtained by the two methods were also evaluated. The β-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 the β、γ list 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 ¹³¹I obtained by the two methods are consistent in the range of uncertainty, and the relative standard deviation is 0.27%.

Key words： metrology ¹³¹I digital coincidence;efficiency extrapolation 4πβ(LS)-γ 4πβ(PC)-γ

收稿日期: 2021-11-25 发布日期: 2023-07-17

PACS:

TB98

基金资助:山西省基础研究面上项目(20210302123152)

通讯作者: 徐强(1977-),安徽肥东人,太原理工大学高级实验师,主要从事大学物理实验教学与管理、核物理理论与实验等方面的工作。Email:xuqiang01@tyut.edu.cn E-mail: xuqaing01@tyut.cn

作者简介: 罗丽峰(1993-),女,山西朔州人,太原理工大学硕士研究生,研究方向为放射性核素活度测量。Email:3264067518@qq.com

引用本文:

罗丽峰,刘皓然,梁珺成,范富有,张明,徐强. 两种符合计数方法测定¹³¹I核素活度[J]. 计量学报, 2023, 44(7): 1128-1133.
LUO Li-feng,LIU Hao-ran,LIANG Jun-cheng,FAN Fu-you,ZHANG Ming,XU Qiang. Activity Determination of ¹³¹I by Means of Two Coincidence Counting Methods. Acta Metrologica Sinica, 2023, 44(7): 1128-1133.

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