Survey and mitigation of occupational exposure of radon in workplaces

摘要

The mean radon concentration during working hours was 36/100 higher in the underground spaces thant at ground level. The highest mean radon concentration was found in hillside rooms. The violation of the Finnish occupational exposure limit (OEL is 400 Bq m~(-3)) was 17/100 in the whole data. To quantify the importance of soil as the main sorce of indoor radon was problematic in underground spaces becuse of the large variability of air exchange rates and pressrue differences in the sites studied.