The behavior of recoil bromine atoms arising from the
n, γ reaction on bromate samples in various physical states was studied. The samples irradiated with neutrons were bromate crystals, aqueous bromate solutions and anion exchange resins loaded with bromate ions.
A large fraction of radioactive bromine atoms appeared in such a chemical form as bromide which may be separable from bromate by ion exchange or solvent extraction, whereas the remaining active atoms were found in bromate form.
The degree of retention of active atoms as bromate was dependent strongly upon the physical state of the irradiated sample, decreasing in the following order; solid, solution, resin. The retention values in the solid, solution and resin samples were, respectively, about 20, 5 and 1%.
Clean-cut separation of bromate and active bromine in the irradiated resin samples was performed by successive treatment of the resin samples with 0.5M KNO
3 and then 2M KNO
3. The elution with 2M KNO
3 brought about an effluent containing active bromine atoms with an enrichment factor of, for instance, several hundred. It is worth mentioning that some fraction of active bromine was retained in the resin phase even after the elution with KNO
3 was completed.
Brief discussion was made regarding the mechanism of the retention of active atoms in solid, solution and resin phases.
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