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| Monitoring and analysis of radon concentrations in an underground air-raid shelters in Guang zhou |
| ZHANG Jingbo, WANG Chang, MO Sufang, LI Jinrong |
| Guangzhou Center for Disease Control and Prevention, Guangzhou 510440 China |
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Abstract Objective To acquaint the level of 222Rn concentrations and its behavior in an underground air-raid shelters in Guangzhou.Methods 222Rn concentrations were monitored by the RAD7, and the annual effective dose from 222Rn and its progeny was roughly estimated.Results The daytime averaged 222Rn concentration were 106.7 Bq/m3, 98.4 Bq/m3, 129.0 Bq/m3 and 111.1 Bq/m3 in the command center, wireless communication room, the central main channel and warehouse area channel,respectively, with an average of 111.0 Bq/m3. The personnel's annual effective dose from 222Rn and its progeny was estimated to be 0.400 mSv/a.Conclusion 222Rn concentration and its behavior differs from workplace, ventilation,drainage system or other human activities.
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Received: 17 July 2018
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