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Preconcentration of radioiodine as AgI and purification from radiotellurium waste

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Abstract

A radiochemical method was investigated for separation and preconcentration of radioiodine from alkaline radiotellurium waste solution as Ag125I followed by recovery of 125I into aqueous NH3 solution and final purification by wet distillation. 125I–123mTe radiotracer solution (5 M NaOH) was equilibrated with prepared silver granules for different times and it was found that 125I was quantitatively removed from the aqueous phase after 7.0 h. The 125I-loaded silver was then equilibrated with ammonia solution in the presence of one of different reducing agents (namely, sodium borohydride, dextrose and zinc dust). Different concentrations of NH3 solution and reducing agents were studied. Quantitative recovery of 125I in the aqueous phase was achieved after 1.0 h of equilibration of 125I-loaded silver granules with 2.7M NH3 solution in the presence of Zn dust with a Zn:Ag molar ratio of 0.5. Purification of the recovered 125I was carried out by wet distillation from 20 % H2SO4 in the presence of H2O2. The distilled off 125I was received in a mixture solution of 0.1M NaOH and 0.01M Na2S2O3 with a radionuclidic purity of ≥99.99 %, radiochemical purity of ~98.8 % (as I− anions) and pH-value of ~13.

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Authors and Affiliations

  1. Radioactive Isotopes and Generators Department, Hot Labs Center, Atomic Energy Authority, P.O. Box 13759, Cairo, Egypt

    M. Mostafa, A. F. El-gharbawy & M. A. El-Absy

  2. Nuclear Fuel Technology Department, Hot Labs Center, Atomic Energy Authority, P.O. Box 13759, Cairo, Egypt

    S. E. Soliman

  3. Chemistry Department, Faculty of Science, Menoufia University, Shebin El-Kom, Menoufia, Egypt

    F. A. Aly

Authors
  1. M. Mostafa
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  2. A. F. El-gharbawy
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  3. M. A. El-Absy
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  4. S. E. Soliman
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  5. F. A. Aly
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Correspondence to M. Mostafa.

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Mostafa, M., El-gharbawy, A.F., El-Absy, M.A. et al. Preconcentration of radioiodine as AgI and purification from radiotellurium waste. J Radioanal Nucl Chem 300, 1089–1097 (2014). https://doi.org/10.1007/s10967-014-2988-2

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  • DOI: https://doi.org/10.1007/s10967-014-2988-2

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