Indoor radon concentrations caused by construction materials in 23 workplaces

The aim of this study was to compare the measured and the calculated concentrations of indoor radon caused by building materials at 23 workplaces. The measured concentrations of radon were clearly higher than the calculated radon concentrations from the building materials, which indicated that the main source of indoor radon was the soil under and around the buildings. The highest means of continuously Ž933 Bq m 3. and integrated Ž169 Bq m 3. measured and calculated Žfrom 70 to 169 Bq m 3. concentrations of radon were found in hillside locations. On the other hand, the median Ž27 and 43 Bq m 3. and maximum Ž626 and 1002 Bq m 3. values of calculated indoor radon concentrations exhaled from construction materials were the highest at the ground level places. On average, only 7 19% of the radon seemed to originate from the construction materials.