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Status of a national monitoring program for environmental radioactivity and investigation of artificial radionuclide concentrations (134Cs, 137Cs and 131I) in rivers and lakes
Analytical Science and Technology / Analytical Science and Technology, (P)1225-0163; (E)2288-8985
2015, v.28 no.6, pp.377-384
https://doi.org/10.5806/AST.2015.28.6.377
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(2015). Status of a national monitoring program for environmental radioactivity and investigation of artificial radionuclide concentrations (134Cs, 137Cs and 131I) in rivers and lakes. Analytical Science and Technology, 28(6), 377-384, https://doi.org/10.5806/AST.2015.28.6.377
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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, <TEX>$^{134}Cs$</TEX>, <TEX>$^{137}Cs$</TEX>, <TEX>$^{131}I$</TEX>, Environmental monitoring
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