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The Significance of Mobilization and Immobilization of Specific Radionuclides for Optimum Bioleaching Conditions Using Aspergillus lentulus

  • RADIOBIOLOGY, ECOLOGY AND NUCLEAR MEDICINE
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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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ACKNOWLEDGMENTS

The authors would like to thank Prof. Dr. Mohamed El-Feky, Head of Geochemical Exploration Department, Nuclear materials authority (NMA) and Prof. Dr. Afaf Nada, Women’s College for Arts, Science and Education, Ain Shams University, for their help and assistance during the preparation of this paper.

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Authors and Affiliations

  1. Nuclear Materials Authority (NMA), El-Maadi, 11742, Cairo, Egypt

    Nareman Harpy & Sameh El Dabour

  2. Nuclear Engineering Department, Military Technical College, Kobry El-Kobba, 11772, Cairo, Egypt

    Mohamed A. E. Abdel-Rahman

  3. Physics Department, Faculty of Science, Ain Shams University, Cairo, Egypt

    Abdelsattar M. Sallam

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  1. Nareman Harpy
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  2. Mohamed A. E. Abdel-Rahman
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  3. Abdelsattar M. Sallam
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  4. Sameh El Dabour
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Correspondence to Mohamed A. E. Abdel-Rahman.

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Nareman Harpy, Abdel-Rahman, M.A., Sallam, A.M. et al. The Significance of Mobilization and Immobilization of Specific Radionuclides for Optimum Bioleaching Conditions Using Aspergillus lentulus. Phys. Part. Nuclei Lett. 17, 253–259 (2020). https://doi.org/10.1134/S1547477120020077

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  • DOI: https://doi.org/10.1134/S1547477120020077

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