| SUN Quan-fu,Tokonami Shinji,HOU Chang-song.Concentrations of indoor radon and thoron in cave-dwellings with discussions on risk estimation of lung cancer[J].Chinese Journal of Radiological Medicine and Protection,2005,25(1):1-5 |
| Concentrations of indoor radon and thoron in cave-dwellings with discussions on risk estimation of lung cancer |
| Received:May 18, 2004 |
| DOI： |
| KeyWords:Cave-dwelling Radon Thoron Progeny of thoron Tobacco-smoking rate Migration |
| FundProject:科学技术部2002年度社会公益研究专项基金资助项目(2001DA10001) |
| Author Name | Affiliation | | SUN Quan-fu | National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088, China | | Tokonami Shinji | Radon Research Group, Research Center for Radiation Safety, National Institute of Radiological Sciences, Japan | | HOU Chang-song | National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088, China | | 张守志 | National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088, China | | 卓维海 | Radon Research Group, Research Center for Radiation Safety, National Institute of Radiological Sciences, Japan | | 古川雅英 | Radon Research Group, Research Center for Radiation Safety, National Institute of Radiological Sciences, Japan | | 石川徹夫 | Radon Research Group, Research Center for Radiation Safety, National Institute of Radiological Sciences, Japan | | 米原英典 | Radon Research Group, Research Center for Radiation Safety, National Institute of Radiological Sciences, Japan | | 秋叶澄伯 | Faculty of Medicine, Kagoshima University | | 郑桂芳 | 陕西省卫生防疫站 | | 俞惠莲 | National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088, China | | 聂晓潜 | National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088, China | | 王润溪 | 山西省卫生防疫站 | | 尚兵 | National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088, China | | 山田裕司 | Radon Research Group, Research Center for Radiation Safety, National Institute of Radiological Sciences, Japan |
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| Abstract:: |
| Objective To explore a residential area with elevated indoor radon exposure for conducting epidemiological studies on indoor radon and lung cancer. Methods Two hundred and two cave-dwellings (CD) including loess CD,brick CD,stone CD,and ordinary house in twenty villages were selected from Yan'an and Lüliang in the Chinese loess plateau.Indoor levels of thoron and its progeny as well as radon were measured with passive radon-thoron discriminative detectors and thoron progeny deposition rate devices.The exposure period covered from August 2001 through August 2002. Results Loess CD was one of the most common type of dwelling caves in both areas.The indoor radon concentrations in loess CD ranged from 17 to 179 Bq/m3;thoron varied substantially depending upon the distance from the device to the wall,ranged from 10 to 760 Bq/m3.Geometric means of indoor radon,thoron and thoron′s progeny (EEC Tn) of loess caves in Yan'an area were estimated to be 71,185 and 2.2 Bq/m3,respectively,and the corresponding figures were 73,145 and 1.6 Bq/m3 in Lüliang area.Possible contamination of thoron on radon measurement in a previous case-control study on lung caner was discussed.The study revealed that the indoor air pollution in Yan'an area was slight compared with that in Lüliang area.Migration was very low.Eighty-six percent of the investigated persons have had no migration in Yan'an area,and 90 percent of the cave-dwellings where the subjects once resided were available to our measurements.Two million people have been living in cave-dwellings over several generations. Conclusion The investigated cave-dwelling area in Yan'an is suitable for conducting epidemiological study on residential thoron and radon exposure and lung cancer. |
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