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| Levels of indoor thoron (220Rn) concentrations in China |
| LEI Shujie, LI Xiaoliang, ZHANG ShouZhi, SUN Quanfu |
| Key Laboratory of Radiological Protection and Nuclear Emergency, China CDC, National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088 China |
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Abstract The health effects of thoron (220Rn) and its daughters have attracted more and more attentions. The content of 232Th in soil in China is obviously higher than that of the world, which leads to high content of 232Th in building materials. In our country the materials of a considerable number of residential houses are brick and soil. So the level of 220Rn in the house is higher than that of 222Rn. Based on the papers of 220Rn and its daughters published at home and abroad, the actual radiation doses might be higher than the estimated average of the world. The balance equivalent concentrations of 222Rn and 220Rn calculated by ICRP 50 publication were 15 Bq/m3 and 0.5 Bq/m3. The increasing numbers of lung cancer were 32 and 3.6 per 1,000,000 person-years, respectively. The geological structure and geological fracture are different in different regions in China. The loess plateau in northwest region, the Gejiu city in southwest region and Yangjiang city in south China are typical high level of thoron areas. The levels of indoor 220Rn in the three areas are higher than that of 222Rn. The concentration of 220Rn in cave dwelling in loess plateau was higher than the other two areas. 220Rn concentration was up to 9 times of 222Rn in cave dwelling. The effective dose of 220Rn and its daughters in cave dwelling was much higher than that of 222Rn and its daughters.
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Received: 10 July 2017
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