Estimation of radon concentration in office and doses received by residents in Shijiazhuang city

Objective: To test the level of office radon concentration of residential areas in Shijiazhuang City in different floors, building materials and construction age and to analyze its influencing factors in order to estimates the exposure doses received by the residents. Methods: solid state nuclear track method was used measure the cumulative dose of radon concentration. Results: The mean concentration of office radon concentration was (32.12 ± 13.74) Bq·m^-3 in Shijiazhuang City. The highest values were in the reinforced concrete cottage. The dose caused by the radiation was 0.58 mSv/a. Conclusion: The level of office radon concentration of residential areas in Shijiazhuang City is a normal natural backgrood level. Building materials are the major factors that affect the office radon concentration. Selection of appropriate materials for construction and effective ventilation can reduce radiation doses received by residents, thus reducing its negative impacts on human health. (authors)