Abstract
Radioactivity of U, Th and 40K has been tested in the vicinity of the ash repository of coal-fired power plant “Nikola Tesla” A in Obrenovac (Yugoslavia). By using the methods of alpha and gamma spectrometry, as well as luminescence spectrophotometry, it has been found that the ash repository is a source of radionuclides of the uranium and thorium series and spreads direction of ground waters up to a distance of several hundred metres. The influence of the repository on the soil radioactivity has been found to be minimal, whereas the balance of the first members of series ( 238U- 234U- 230Th; 232Th- 228Th) has not been disturbed.
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