High radon concentrations indoors usually depend on the possibilities of radon penetration from thesurrounding soil into the buildings. Radon concentrations in dwellings up to 100 kBq/m were found insome special regions (i.e. Schneeberg/Saxony, Umhausen/Tyrol) where the soil shows a high uraniumcontent and additionally a fast radon transport in the soil is possible. To reduce the radon exposure ofthe inhabitants in these "radon prone areas" it is necessary to look for building and insulating materialswith low radon permeability.
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