| CUI Hong-xing,WU Yun-yun,ZHANG Qing-zhao,SHANG Bing.Seasonal variation in concentration of radon and thoron at non-uranium mines in China[J].Chinese Journal of Radiological Medicine and Protection,2009,29(6):639-642 |
| Seasonal variation in concentration of radon and thoron at non-uranium mines in China |
| Received:March 13, 2009 |
| DOI：10.3760/cma.j.issn.0254-5098.2009.06.030 |
| KeyWords:Non-uranium mine Radon Thoron Seasonal variation |
| FundProject:科技部科研院所社会公益研究专项资助项目(2005DIB1J087) |
| Author Name | Affiliation | E-mail | | CUI Hong-xing | Institute for Radiological Protection and Nuclear Safety, Chinese Centre for Disease Control and Prevention, Beijing 100088, China | | | WU Yun-yun | Institute for Radiological Protection and Nuclear Safety, Chinese Centre for Disease Control and Prevention, Beijing 100088, China | | | ZHANG Qing-zhao | Institute for Radiological Protection and Nuclear Safety, Chinese Centre for Disease Control and Prevention, Beijing 100088, China | | | SHANG Bing | Institute for Radiological Protection and Nuclear Safety, Chinese Centre for Disease Control and Prevention, Beijing 100088, China | shangbing100088@yahoo.com.cn |
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| Abstract:: |
| Objective To study the seasonal variation in concentrations of radon and thoron in non-uranium mine. Methods Eight kinds of mineral types from 9 non-uranium mines were selected, including copper, gold, aluminium, manganese, antimonium, tungsten,copper-nickel and coal mines in 6 provinces, such as Yunnan, Shandong, Xinjiang, Heilongjiang, Hunan and Guizhou. LD-P R-T discriminative detectors were used to measure radon and thoron concentrations in underground mines during four seasons in one year. Results Radon concentrations in underground mines showed a significantly seasonal variation. Radon concentration ranged from 35.5 to 4841 Bq/m3 in summer, and the average value in four mines exceeded 1000Bq/m3 of the control limit for workplace (GB 18871-2002). In winter, radon concentration ranged from 5 to 1917Bq/m3, only one of them exceeded the control limit. The ratio of radon from summer to winter ranged from 2 to 12. Ventilation was one of the main factors which influenced the seasonal variation of radon.While the thoron concentration in underground mines showed a tendency that it was higher in summer and lower in winter. It was difficult to attain representative values for thoron, due to the influence of location of detectors.The seasonal variation of thoron should be further studied. Conclusions Seasonal varation for radon and thoron should be taken into account to estimate the effective dose to miners. The values of radon concentration during the short term should be corrected. |
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