| ZHOU Qiang,LI Wen-hong,ZHANG Jing,et al.Environmental radioactivity investigation and external dose estimation in some districts of Yunnan Province[J].Chinese Journal of Radiological Medicine and Protection,2011,31(5):590-594 |
| Environmental radioactivity investigation and external dose estimation in some districts of Yunnan Province |
| Received:June 29, 2010 |
| DOI：10.3760/cma.j.issn.0254-5098.2011.05.023 |
| KeyWords:Soil Natural radioanuclides Cosmic radiation External dose |
| FundProject:国防科技预研基金(513310404) |
| Author Name | Affiliation | | ZHOU Qiang | National Institute for Radiological Protection and Nuclear Safety, Chinese Center for Disease Control and Prevention, Beijing 100088, China | | LI Wen-hong | National Institute for Radiological Protection and Nuclear Safety, Chinese Center for Disease Control and Prevention, Beijing 100088, China | | ZHANG Jing | National Institute for Radiological Protection and Nuclear Safety, Chinese Center for Disease Control and Prevention, Beijing 100088, China | | TUO Fei | National Institute for Radiological Protection and Nuclear Safety, Chinese Center for Disease Control and Prevention, Beijing 100088, China | | ZHANG Qing | National Institute for Radiological Protection and Nuclear Safety, Chinese Center for Disease Control and Prevention, Beijing 100088, China | | ZHAO Li | National Institute for Radiological Protection and Nuclear Safety, Chinese Center for Disease Control and Prevention, Beijing 100088, China | | XU Cui-hua | National Institute for Radiological Protection and Nuclear Safety, Chinese Center for Disease Control and Prevention, Beijing 100088, China |
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| Abstract:: |
| Objective To measure the current environmental radioactivity levels in some districts of Yunnan Province, and to estimate the external doses to local residents. Methods The surface soil, aerosol and water samples were collected and analyzed by HPGe gamma spectrometry. Based on the estimation model selected by Ministry of Health in the nationwide soil survey, the doses to local residents from 238U, 226Ra, 232Th, 40K and 137Cs in environmental samples were estimated. CARI-6 software issued by FAA (Federal Aviation Administration) was used to estimate cosmic radiation dose to the local population. Results The external annual dose rate to the local people was 1.13 mSv per year, of which 0.52 mSv per year was contributed by natural radionuclides in soil, 0.6 μSv per year by 137Cs in soil and 0.61 mSv per year by cosmic radiation. Conclusions The cosmic radiation and natural radionuclides in soil might contribute 99.95％ of external exposure dose, while artificial radionuclide 137Cs contribute 0.05% of external exposure dose. |
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