Radiochemical Separation of ¹³²I From Mixed Fission Products

The radiochemical separation procedure of ¹³²I was designed on the basis of half－lives of iodine and tellurium isotopes in mixed fission products. It mainly includes the evaporation step with concentrated HBr and the extraction step with CCl₄. Decontamination of iodine was studied by the process of evaporation with concentrated HBr. The effects of HNO₃ concentration, KI quantity in aqueous phase and I₂ quantity in CCl₄ on extraction recovery of ¹³²I were also researched. ¹³²I was back extracted by SO₂ aqueous solution in separation procedure. Using designed procedure, ¹³²I was separated from mixed fission products. The activity of ¹³¹I in separated ¹³²I is 1.3％of ¹³²I. The chemical recovery of ¹³²I is about 60% and the decontamination factor is more than 10³ for most γ－emitters.