Abstract
The paper presents the preliminary results of determination of natural and anthropogenic radionuclides ( 7 Be, 210 Pb, 235 U, 238 U, 232 Th, 40 K, 137 Cs) in ground level air, soils and tree leaves in Belgrade urban area. Activities of the radionuclides were determined on an HPGe detector (ORTEC, relative efficiency 23%) by standard gamma spectrometry. The content of the radionuclides in soils were within the average values for the region and the 235 U/ 238 U ratio confirmed the natural origin of uranium. The average radionuclides concentrations in ground level air in the urban areas were within the range of the values obtained in the long-term study on the ground level air radioactivity in the city area, exhibiting in general the same seasonal variations pattern. The highest concentrations of 210 Pb in aerosols were measured in the very center of the city. There were no significant differences in the content of 7 Be and 40 K in leaves, whereas further investigations are needed to confirm the differences in the content of 137 Cs and 210 Pb due to the plant morphology (horse chestnut, linden) or seasonal variations. The study is in progress.
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