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| Activity Determination of 131I by Means of Two Coincidence Counting Methods |
| LUO Li-feng1,2,LIU Hao-ran2,LIANG Jun-cheng2,FAN Fu-you2,ZHANG Ming2,XU Qiang1 |
1. College of Physics and Optoelectronics, Taiyuan University of Technology, Taiyuan, Shanxi 030024, China
2. National Institute of Metrology, Beijing 100029, China |
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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%.
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Received: 25 November 2021
Published: 17 July 2023
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2023, Vol. 44 
