2026-05-05T06:18:20.341Z http://ezaposleni.singidunum.ac.rs/rest/sciNaucniRezultati/oai

ezaposleni.singidunum.ac.rs/rest/sciNaucniRezultati/oai:1:11722 2025-11-25T08:07:46Z 1

GEOSPATIAL ANALYSIS OF RADIOACTIVITY DISTRIBUTION IN ALLUVIAL SOILS OF THE KOLUBARA RIVER BASIN AT 20 CM DEPTH 2025 504.5:539.1.17 http://ezaposleni.singidunum.ac.rs/rest/sciNaucniRezultati/oai/record/1/11722 https://doi.org/10.5281/zenodo.17533517 V. Gajić B. Vakanjac N. Milić This paper presents a study of the spatial distribution of radioactivity in alluvial soils across the Kolubara river basin. A total of 136 alluvial soil samples were collected at a depth of 20 cm along the main course of the Kolubara and its tributaries and subsequently analysed for gamma radiation under laboratory conditions. The measured gamma dose rates (μSv/h) ranged from approximately 0.12 to 0.41 μSv/h, mainly exhibiting values around 0.20-0.25 μSv/h. Most recorded values correspond to the expected natural background radiation, while about 5% of locations demonstrated moderately elevated levels (above ~0.30 μSv/h). The highest gamma dose rates were observed locally at several sites within the catchments of the Ljig, Tamnava, Ub, and Obnica rivers. In contrast, the lowest levels were registered in the downstream section of the Kolubara and the Jablanica sub-basin. Spatial GIS analysis (using quantile classification) revealed the absence of a simple longitudinal gradient-zones of higher values appear sporadically, likely reflecting heterogeneous geological substrates and/or localized radionuclide sources. However, certain “hot spots” warrant further investigation regarding the origins of elevated radioactivity to preserve environmental quality. conferenceObject 155 159 10.5281/zenodo.17533517 Proceedings of the 52nd Symposium on Operational Research (SYM-OP-IS 2025)