Abstract
Radon concentrations in air and gamma dose rates were measured in a hundred and sixty-seven houses in Belgrade. Indoor radon concentrations determined by alpha scintillation counting were in the range from 10 to 200 Bq.m 3 and were roughly correlated with building materials corresponding to the age of the house. The vertical distribution of the mean radon indoor concentrations was also estimated. The annual effective equivalent dose for indoor radon and its short-lived daughters estimated for the mean radon in air concentration (58 Bq.m -3 ) was 1.3 mSv. The contents of natural radionuclides ( 232 Th, 226 Ra, 40 K) in raw building materials (gravel, quartz sand, cement, unhydrated lime) and final products (Siporex expanded concrete) were determined by standard gamma spectrometry.
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