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J Korean Soc Environ Eng > Volume 38(1); 2016 > Article
J Korean Soc Environ Eng 2016;38(1): 42-46. doi: https://doi.org/10.4491/KSEE.2016.38.1.42
감마분광분석을 이용한 환경 중 방사성요오드(131I)의 측정 불확도에 관한 사례 연구
조윤해, 설빛나, 민경옥, 김완석, 이준배, 이수형
국립환경과학원 금강물환경연구소
A Case Study about Counting Uncertainty of Radioactive Iodine (131I) in Public Waters by Using Gamma Spectrometry
Yoonhae Cho, Bitna Seol, Kyoung Ok Min, Wan Suk Kim, Junbae Lee, Soohyung Lee
Geum River Environment Research Center, National Institute of Environmental Research
Corresponding author  Yoonhae Cho ,Tel: 043-730-5655 , Fax: 043-733-9408, Email: yh.cho@korea.kr
Received: October 5, 2015;  Revised: November 4, 2015;  Accepted: January 25, 2016.  Published online: January 31, 2016.
ABSTRACT
The radioactive iodine (131I) presents in the environment through the excrete process of nuclear medicine patients. In the detecting of low level of 131I in the public water, the counting uncertainty has an effect on the accuracy and reliability of detecting 131I radioactivity concentration. In this study, the contribution of sample amount, radioactivity concentration and counting time to the uncertainty was investigated in the case of public water sample. Sampling points are public water and the effluents of a sewage treatment plant at Sapkyocheon stream, Geumgang river. In each point, 1, 10 and 20 L of liquid samples were collected and prepared by evaporation method. The HPGe (High Purity Germanium) detector was used to detect and analyze emitted gamma-ray from samples. The radioactivity concentration of 131I were in the range of 0.03 to 1.8 Bq/L. The comparison of the counting uncertainty of the sample amount, 1 L sample is unable to verify the existence of the 131I under 0.5 Bq/L radioactivity concentration. Considering the short half-life of 131I (8.03 days), a method for measuring 1 L sample was used. However comparing the detecting and preparing time of 1, 10 L respectively, detecting 10 L sample would be an appropriate method to distinguish 131I concentration in the public water.
Key Words: Radioactive Iodine (131I), Counting Uncertainty, Environmental Radiation, Gamma Spectrometry
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