Assessment and Gis Mapping of Radioactivity In River Nile and Red Sea States

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Hamza,Nsreen Mohamed Elhassn Mohamed
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University of Khartoum
ABSTRACT The aim of the research is to evaluate the absorbed gamma-dose rate in air at 1 m height from the ground level from concentration of natural radionuclides 226Ra, 232Th and 40K in soil samples. Soil samples were collected from different locations in River Nile and Red Sea States and measured using gamma-spectrometry equipped with NaI (TI) detector. The average concentration of 226Ra, 232Th and 40K in soil samples were found to be 11.7±3.9 Bg/kg, 22.21±6.5Bg/kg and 30.7±8.3Bg/kg, respectively. The obtained results are lower than the corresponding global values reported in the UNSCEAR publications for normal background areas. Absorbed dose rate in air at height of 1m from the ground averaged 63±15 nGyh-1. It corresponds to annual effective dose of 78.2±18.9_6;Sv/y. GIS predictive maps produced for activity concentrations of each radionuclide as for as well for absorbed dose rate in air revealed a tendency of increasing activity north towards south direction.
52 Pages
Assessment ; Gis ;Mapping Radioactivity ; River Nile ; Red Sea