Sequential distillation of fission-produced radioiodine and radioruthenium from sulfuric acid solutions |
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Authors: | M. A. El-Absy H. F. Aly M. A. Mousa M. Mostafa |
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Affiliation: | (1) Hot Laboratories Center, Atomic Energy Authority, P. O. Code No. 13759, Cairo, Egypt;(2) Faculty of Science, Zagazig University Benha Branch, Benha, Egypt |
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Abstract: | Fission-produced 131I and 103Ru radionuclides have been separated sequentially by distillation from H2SO4 of controlled chemical composition. The thermal-neutron irradiated uranium trioxide targets were digested in 2M NaOH solution and then, the supernatant solution was acidified to 20% H2SO4 with addition of a few drops of H2O2 solution. On boiling for 3.5 hours, ≥99.99%131I was volatilized, passed through 3M H2SO4 traps, and then collected in 0.1M NaOH + 0.01% Na2S2O3 solution with a recovery yield of 73.6%. The product radionuclide had high radiochemical and radionuclidic purities. After separation of 131I, the fission-product solution was acidified to 40% H2SO4 acid containing KMnO4 as an oxidant and boiled for 40 minutes. Ruthenium nuclides were volatilized and collected in 0.1M NaOH solution. Gamma-ray spectrometry showed that the separation and the recovery yields of 103Ru were ≥99.99 and 65%, respectively, with ~92% radionuclidic purity, measured immediately after separation. The radionuclides of 132I and 106Rh were the main contaminants detected in the obtained 103Ru product solution. This revised version was published online in July 2006 with corrections to the Cover Date. |
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