Abstract
Gamma spectrometry is applied for measurement of natural radioactivity by Hyper-pure germanium (HPGe) systems during the application of bioleaching optimum conditions in ore and waste samples. The bioleaching of the ore sample using isolated fungus A. lentulus indicate that the bioleaching efficiency of 234U, 232Th are higher than 238U, 230Th and 235U which may attributed to the effect α-recoil rate for 234U, organic matter, clays or iron oxide and or/lower activity concentration of 232Th. The immobilization of 238U, 235U, 230Th, 214Pb, and 214Bi in ore and waste samples could be result from high organic matter content, iron, and manganese oxides, in addition to the role of microbes that can resist leaching by their cellular compounds. The high mobility of some radionuclides in waste samples may be resulted from the leaching process of the original rocks using acid solution that clean the grain surfaces leaving spaces around the grains and this permit the organic acids to reach the inner parts of the grains during bioleaching processes leading to the high mobility 234U, 232Th and to lesser extent 238U and 235U. The radionuclides 226Ra, 214Pb and 214Bi were found almost totally in the residue of two sample (Q and W) indicating to be associated with radium sulphate or relatively insoluble mineral phases like alumina silicates and refractory oxides.
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