Some Studies on (n, γ) Recoil of lodine-128 in Alkaline Aqueous lodate and Periodate

Abstract

Hot atom chemistry / Iodine-128 / lodate / PeriodateSummary (n, y) reactions in alkaline aqueous solutions of KIO, and KI0 4 have been studied in presence of chloride and acetate additives. It has been found that the retentions and yields are remarkably influenced by additives. The radioiodate, -iodide and -periodate fractions observed from neutron irradiation of alkaline aqueous KI0 3 are about 20%, 75% and 5%, respectively, while those observed from alkaline aqueous KI0 4 are about 80%, 10% and 10%, respectively. With the increase of concentrations of the additives, the radioiodate, -iodide and -periodate yields reach the limiting values of about 28%, 54% and 18%, respectively, from both KIO3 and KI0 4 . The irradiation in frozen alkaline aqueous phase leads to retentions and yields remarkably different from those observed in the aqueous phase. The role of water molecules and additives, post recoil effect and chemical effects associated with local radiolysis and internal conversion are discussed to explain the observed results.

Recoil Halogen Reactions in Liquid and Frozen Aqueous Solutions of Biomolecules

“…With increasing solute concentration there is a rapid increase in parent tions of halogenated biomolecules because the yield of inorganic activity as the labelled halide ion from aqueous halide solution is 100% or approaches 100% with decreasing solute concentration in liquid aqueous solutions of the halogenated biomolecules. This is in contrast to interesting experiments by BERA and SHUKLA [20,21 ] involving neutron irradiation of liquid and frozen aqueous solutions of iodates, periodates, and H 5 I0 6 , where these authors only find the iodide ion as a major product in frozen and liquid aqueous solutions of KIO3, and a minor product in solutions of KIO4 and H 5 10 6 . No experimental evidence for the formation of labelled XO" was found in our study.…”