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| Investigation and Evaluation of Radon Concentration in Air in Chongming, Shanghai |
| MA Ji-ying, ZHU Li-dong, WANG Jin-xiang, DING Liang-cheng, CHENG Gang, QIAN Zhi-hua, ZHANG Biao, DING Yue-hua, GU Yu-xian |
| Chongming County Center for Disease Control and Prevention, Shanghai 202150 China |
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Abstract Objective To investigate the outdoor and indoor radon levels and estimate its effective doses to residents. Methods Selected and classified the samples to be tested based on the data of National Population Census 2010 about Chongming population proportion, building types, construction time and materials, et. al. The samples were tested for indoor and outdoor radon concentrations using the RAD7 Electronic Radon Detector. The results were statistically processed and analyzed with SPSS 17.0 software. Results The indoor 222Rn concentration was from 5.75 Bq/m3 to 195.29 Bq/m3, with the average value (Bq/m3) of 25.76 ±2.07. About 73.89% of indoor radon concentrations were below 40 Bq/m3. Outdoor 222Rn concentrations were between 5.70 Bq/m3 and 19.32 Bq/m3, with the average value (Bq/m3) of 9.92 ±1.43. Conclusion The results showed that the indoor radon concentrations in Chongming were within the recommended control limit of the national standard. The average annual inhaled effective dose of radon by residents was 0.74 mSv.
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Received: 12 April 2014
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