Abstract
A method of calculation was developed for evaluating the contributions of external (gamma) and internal (alpha) doses due to the natural radioactivity of building materials. The radionuclides examined are 40K and members of the 235U, 238U and 232Th radioactive decay chains. The method makes it possible to correlate the specific activities of these radionuclides in material used for constructing the walls of a room with the alpha and gamma dose absorbed by an individual at the centre of the room. The results obtained are in agreement with the experimental data and with values calculated by other authors.
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