Assessment of Radon Exposure in Kindergartens in North-East Italy

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Abstract
Radon concentrations in 166 schools of FVG district were measured with passive dosemeters over a five month period. Values ranged from 14 to 1181 Bq.m-3, with a mean of 156 Bq.m-3 and a GM of 96 Bq.m-3. These values are 50-60% higher than those estimated for houses, probably because schools are more frequently located in one-storey buildings. In 8% of the samples schools radon levels exceed 400 Bq.m-3. Data analysis outlines the importance of the ground as a source of indoor radon, but also of building structure and tightness. The geographical distribution of radon is well correlated with the regional geology, showing in the FVG alluvial Upper Plain, a significant proportion of schools with elevated levels of radon. When taking account of the results and the occupancy factors assessed from the survey, the average annual exposure in FVG kindergartens is estimated to be less than half that in homes.

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