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Radioactivities dispersed from 0.1 N sodium hydroxide solutions of 123I, 125I, or 131I were measured, and the factors influencing dispersion of radioiodines were analyzed. The radioiodines dispersed were trapped by glass fiber filters, charcoal filters, and separable paint. The factors influencing the dispersion of radioiodines are discussed in terms of the dispersal rate, which defined as the ratio of total activity of three kinds of traps in a unit time to whole activity. In order to clarify the factors influencing the dispersal rate, we carried out the experiments; on the effect of reducing agent, that of radioactive concentration of radioiodine, that of mixing the 125I solution with 131I, and that of scavenging hydrated electrons and hydroxyl radicals. It could be concluded from experimental results that the principal factors influencing dispersion of radioiodines are the number of atoms of radioiodine per volume and the energy absorbed in solution from radioiodines. In regard to the absorbed energy, we thought that the dispersion of radioiodines is influenced mainly by hydrated electron, not markedly by hydroxyl radical.

On the factors influencing the dispersion of radioiodines.