Assessment of radiological risk for marine biota and human consumers of seafood in the coast of Qingdao, China

文献类型： 外文期刊

第一作者： Ha, Yiming

作者： Ha, Yiming

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关键词： Seafood;Radionuclide;Activity concentration;Dose;Radiological risk

期刊名称：CHEMOSPHERE （ 影响因子：7.086； 五年影响因子：6.956 ）

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收录情况： SCI

摘要： This paper reports the levels of Ra-226, Th-232, K-40 and Cs-137 in the edible parts of 11 different marine species collected from the Qingdao coast of China. The activities of Ra-226, Th-232 and K-40 ranged from 0.08 +/- 0.03 to 1.65 +/- 0.60 Bq kg(-1) w.w., 0.09 +/- 0.02 to 1.44 +/- 0.10 Bq kg(-1) w.w., 26.89 +/- 1.25 to 219.25 +/- 5.61 Bq kg(-1) w.w., respectively. Artificial Cs-137 was undetectable or close to the detection limit in the biota sampled. To link radioactivity to possible impact on health, we calculated radiation doses to both the marine biota and human beings. We showed that doses in all cases were dominated by naturally occurring K-40 and that Cs-137 doses were negligible compared with K-40-derived doses. The total doses to marine biota ranged between 16.55 and 62.41 nGy h(-1) among different biota species, which were below the benchmark level of aquatic organism. The committed effective dose to humans through seafood consumption varied from 10.55 to 36.17 mu Sv y(-1), and the associated lifetime cancer risks ranged from 5.93E-05 to 9.49E-05 for different age and gender groups. Both the dose and cancer risk to humans were at the acceptable range. Despite the significant amount of radionuclides released as a result of the Fukushima accident, their impact on the seafood in Qingdao coast appears to be negligible based on our measurements of concentrations of radionuclide activity and internal dose estimates. (C) 2015 Elsevier Ltd. All rights reserved.

分类号： X5

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