Abstract
Methods to calculate the gamma ray exposure due to radioactivity of building materials in dwellings and to measure the rate of radon exhalation from these materials are presented. The average rates of gamma ray exposure in dwellings made of different Finnish materials were calculated and the results were compared with the measured exposure rates. The variation of exposure rate at different points in a dwelling was examined. The rates of radon exhalation, in units of Bq.m-2.h-1, were measured from samples of different building materials. Radon exhalation rates from concrete, slag aggregate concrete and by-product gypsum of different thicknesses are presented.
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