Abstract
A survey study on natural radioactivity of (214)pb, Bi-214 in U-238 series and Tl-208, Ac-228 in Th-232 series in granite rock collected from the state of southern Kordofan (Kadugli), Sudan has been carried out by using gamma-ray spectroscopy technique. The gamma-ray spectra have been measured for daughter decaying of 238U and 232Th series. Elemental and activity concentrations were found to be 1.41 +/- 0.02 ppm and 17.41 +/- 0.19 Bqkg(-1) for Pb-214, 1.66 +/- 0.02 ppm and 25.60 +/- 0.21 Bqkg(-1) for Bi-214 and 9.56 +/- 0.11 ppm and 38.81 +/- 0.43 Bqkg(-1) for Tl-208, 8.55 +/- 0.06 ppm and 34.71 +/- 0.23 Bqkg(-1) for Ac-228, respectively. Moreover, average activity concentrations of these radio-nuclides for granite samples have been compared with the typical values of different countries.