Objective::To explore the level of indoor radon concentration especially after recent 3 decades’ great economic development in metropolis Beijing, so as to describe the outline of indoor radon level in Beijing.Methods::A one-year integrated measurement on 800 dwellings was carried out from September 2018 to August 2019. Passive integrated radon cup monitor with CR-39 as an alpha-track detector was adopted for the survey. As a pilot study, measurement scheme was designed in detail. For measurement quality control, the background track density of CR-39 was strictly defined and controlled throughout the operation of the survey.Results::The annual geometric and arithmetic mean of radon concentration of the surveyed are (39.3 ± 12.9) and (42.0 ± 13.7) Bq/m 3, respectively, varying from (12.1 ± 2.5) to (119.0 ± 7.8) Bq/m 3. Radon concentration of the ground floor dwellings is obviously higher than that of other floors. No difference of radon level is found among the dwellings of other floors. Higher radon concentration in buildings built after 2010 is obtained compared with buildings built in 1980s, 1990s, and 2000s. Conclusions::There is no big change of radon concentration level in dwellings in Beijing area observed in general compared with a previous survey performed more than ten years ago. For high-rise buildings, building materials are suggested to be the main source of indoor radon. For higher radon concentration in buildings built in latest ten years, the change on building materials and indoor ventilation rate are thought to be the causes, further study in detail is needed to clarify.

Indoor radon concentration;Integrated measurement;CR-39;Quality control;Beijing

Wang Hao;Zhang Lei;Gao Peng;Guo Qiuju

State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, China;State Key Laboratory of NBC Protection for Civilian, Beijing 102205, China;Beijing Nuclear and Radiation Safety Center, Beijing 100089, China

放射医学与防护（英文）

[1]Wang Hao;Zhang Lei;Gao Peng;Guo Qiuju-.A pilot survey on indoor radon concentration in Beijing)[J].放射医学与防护（英文）,2022(01):22-25

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