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http://dx.doi.org/10.5806/AST.2015.28.6.377

Status of a national monitoring program for environmental radioactivity and investigation of artificial radionuclide concentrations (134Cs, 137Cs, 131I) in rivers and lakes  

Kim, Jiyu (Water Quality Assessment Research Division, National Institute of Environmental Research)
Jung, Hyun-ji (Water Quality Assessment Research Division, National Institute of Environmental Research)
An, Mijeong (Water Quality Assessment Research Division, National Institute of Environmental Research)
Hong, Jung-Ki (Water Quality Assessment Research Division, National Institute of Environmental Research)
Kang, Taegu (Water Quality Assessment Research Division, National Institute of Environmental Research)
Kang, Tae-Woo (Yeongsan-River Environment Research Center, National Institute of Environmental Research)
Cho, Yoon-Hae (Geum-River Environment Research Center, National Institute of Environmental Research)
Han, Yeong-Un (Yeongsan-River Environment Research Center, National Institute of Environmental Research)
Seol, Bitna (Geum-River Environment Research Center, National Institute of Environmental Research)
Kim, Wansuk (Geum-River Environment Research Center, National Institute of Environmental Research)
Kim, Kyunghyun (Water Quality Assessment Research Division, National Institute of Environmental Research)
Publication Information
Analytical Science and Technology / v.28, no.6, 2015 , pp. 377-384 More about this Journal
Abstract
A survey of the artificial radionuclides in rivers and lakes was conducted to investigate their levels in surface water. Water samples were collected at 60 points and analyzed by gamma-ray spectrometry with a measurement time of 10,000 seconds for 134Cs, 137Cs, and 131I. The obained values were lower than MDA for all points, except one point for 131I that was 0.533±0.058 Bq/L. 131I is known as a radioactive material that occurs frequently in sewage treatment plants. Because it is often used for medical treatments and subject to spreading into the environment due to the excretion from the patients. For the point where 131I was detected, we conducted additional investigation on the upstream river point and the effluent points of nearby sewage treatment plant to find the source of 131I. 131I was not detected at the upstream points of one of the upstream sewage treatment plants but found at the downstream points with the level being 0.257±0.034 to 0.799±0.051 Bq/L, proving the sewage treatment plant was the 131Isource.
Keywords
Artificial radionuclides; $^{134}Cs$; $^{137}Cs$; $^{131}I$; Environmental monitoring;
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