| XUAN Zhi-qiang,SHANG Bing,WANG Chun-hong,et al.Investigation on radon concentration and dose estimation at some areas in Zhejiang Province[J].Chinese Journal of Radiological Medicine and Protection,2010,30(5):599-603 |
| Investigation on radon concentration and dose estimation at some areas in Zhejiang Province |
| Received:February 01, 2010 |
| DOI： |
| KeyWords:Living room 222Rn 220Rn Effective dose |
| FundProject:国家自然科学基金(10675105) |
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| Abstract:: |
| Objective To investigate the concentrations of indoor radon (222Rn) and its daughter products as well as indoor thoron (220Rn) in selected houses in Yuhang district and Sanmen county, Zhejiang province, and estimate their annual effective doses to the population. Methods Solid state nuclear track detectors were used in selected dwellings in Yuhang district and Sanmen county, and the detectors were placed in bedrooms or living rooms. Without changing the ventilation habits of residents, These detectors were continuously placed from March to September in 2009. Results Indoor 222Rn and 220Rn concentrations in low-rise buildings were the highest among all types of houses. The indoor concentration of 222Rn had no relation with the building age (F =0.53, P >0.05), but that of 220Rn was dependent on the building age (F =3.56, P <0.05). Moreover, the investigation demonstrated indoor 220Rn concentrations in houses with no decoration were higher than in the houses decorated(t =2.33, P <0.05). The average indoor concentrations of 222Rn and 220Rn in Yuhang district were 32.5 Bq/m3 and 314.3 Bq/m3, respectively, and the annual effective doses were 0.88 mSv and 0.42 mSv respectively. The average indoor concentrations of 222Rn and 220Rn in Sanmen county were 26.8 Bq/m3 and 399.5 Bq/m3, and the annual effective doses were 0.72 mSv and 0.53 mSv respectively.Conclusion The concentrations of indoor 222Rn in some areas of Zhejiang province are at natural background level, and the concentrations of indoor 220Rn in rural areas are relatively higher. The total annual effective dose from 220Rn and its progeny was larger than that from 222Rn and its progeny by 50 percents. |
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