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The present work is concerned with the fractionations of  238 U,  230 Th,  226 Ra, 214 Pb,  214 Bi,  235 U,  228 Ac,  208 Tl and  40 K in sulphuric acid leaching and solvent extraction of uranium, in addition to, thiourea leaching of gold. The activity concentrations of the studied radionuclides indicate that uranium isotopes are highly leachable (89–90%) in sulphuric acid, while  230 Th and  208 Tl are leached with efficiency of about 76% and 71%, respectively. Less than 35% of  226 Ra, 214 Pb,  214 Bi and  228 Ac are leached. In solvent extraction processes, uranium isotopes are selectively extracted and stripped. While  208 Tl extraction was only 13%. Most of  230 Th,  226 Ra,  214 Pb and  40 K could not be extracted at such pH. The leachability of the studied radionuclides was significantly low using acidic thiourea. The dose rate and radium equivalent, in addition to the external and internal hazard indices values for the original sample and the uranium and gold tailings are higher than the recommended maximum values.

Mobilisation of radionuclides during uranium and gold processing of granitic rock at El-Missikate area, central Eastern Desert, Egypt