Assessment of Natural Radioactivity Levels and Associated Dose Rates in Soil Samples from Al South Kordofan StateـــDallanj Area

In this study 15 soil samples were collected from Dallanj town where dividing the town into five parts (E, C, S, N and W) using GPS .Three samples were taken from each part. 500 grams of soil sample was weighed and closed in plastic containers for four weeks so as to have secular equilibrium for uranium. Our goal of this study was estimate Investigation of Radionuclides Soil Samples from South of Kordufan state (Western Sudan). Natural radioactivity concentrations in soil samples were measured by gamma-ray spectrometry a with a high purity germanium detector with 37% efficiency compared to the NaI (TI) detector .Calibration process carried out for gamma spectroscopy using MW652 as a reference source which recommended by the International Atomic Energy Agency (IAEA) including-source-Cs-137 and Co-60 with two energy levels . The study aimed to evaluate the levels of normal activity of radioactive elements .from the result was found that the concentration of potassium in the five parts in the range (325.66667 ± 259.954483-39.33333 ± 27) Bq/kg and the concentration of radium in the range (27.50000 ± 7.037755-13.13333 ± 1.404754) The average absorbed dose rate for each region was found to be 11.820793066 ± 2.849046 nGy / h of natural radioactivity of the region.