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Hot Atom Chemistry of Selenium Isotopes Formed by Fission and Neutron Capture

The oxidation states of selenium isotopes formed by fission and neutron capture were investigated in irradiated 0.4 M H2S04 solutions. In neutron capture, higher yields (>95%) of Se (IV) were obtained when starting with both Se (IV) and Se (VI). Since neither scavenger effect nor phase effect was observed, it was confirmed that the distribution was of the hot reactions. In the case of fission, a phase effect, indicating the reducing action of the species diffusing from the fission tracks, was observed in that the fraction of Se(IV) was -90% in the solid phase and ~98% in the liquid phase. The distribution of the oxidation states of the fission products is well elucidated assuming a quasi-chemical equilibrium based on the hot-zone model. The different results for fission and neutron capture are qualitatively attributed to different spike temperatures.