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| Existing Condition Assessment of Radiation Environment Quality in Dwellings |
| XU Jia-ang, LI Fu-sheng, CHEN Ying-min, et al |
| Institute of Radiation medicine, Shandong Academy of Medicine Sciences, Jinan 250062 China |
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Abstract Objective To assess the radiactivity levels of Jinan dwellings and the indoor environment quality.Methods Using the self made Measurement Cups of Indoor Environmental Radioactivity Evaluation (MCIERE) (ZL 200620082698.7)to measure the gamma ray dose rate, 222Rn activity concentration, 220Rn activity concentration and EECTn.Results The geometric mean of 222Rn activity concentrations that showed a clear lognormal distribution tendency in 411 rooms of Jinan was 45 Bq·m-3, the range which was from 18 to 203 Bq·m-3.The geometric mean of 220Rn activity concentration that was also nearly lognormal distribution in 203 rooms of Jinan was 16 Bq·m-3and the range of the activity concentratons was from 1 to 167 Bq·m-3.The geometric mean of EECTn that was nearly lognormal distribution in 204 rooms of Jinan was 1.082 Bq·m-3, the range was from 0.015 to 10.230 Bq·m-3.The arithmetic mean of the gamma ray dose rate that was nearly Gaussian distribution in 412 rooms of Jinan was 0.106μSv·h-1, the concentration range from 0.041 to 0.167μSv·h-1.Conclusion The internal irradiation annual effective dose caused by 222Rn and its progeny, 220Rn and its progeny and of Jinan inhabitant was 1.189 mSv, the external irradiation annual effective dose caused by the gamma ray from the ground and buildings was 0.743 mSv.The mean total annual effective dose was 2.187 mSv and the highest annual effective dose level was above 5 mSv.
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Received: 02 January 2008
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