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    The Radiolytic Decomposition of Crystalline Alkali Metal and Alkaline Earth Bromates


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    Yields for bromate ion decomposition and for the production of oxidizing fragments, bromide ion, and oxygen gas in the radiolysis of the crystalline alkali metal and alkaline earth bromates by cobalt-60 γ-rays, neutron reactor radiations, and lithium-6 fission recoil particles were determined as a function of dose, temperature, and dose rate. The oxidizing fragment yields were strongly temperature dependent. Thus, radiolysis at 300 C gave only bromide ion and oxygen gas; at lower temperatures increasing amounts of oxidizing fragments including hypobromite, bromite, and bromine species with higher oxidation numbers were formed. At large doses the oxidizing fragment concentrations tended to “steady-state” values dependent on the irradiation temperature. These values were determined as a balance between the rate of production of these fragments, their thermal decomposition to bromide ion and oxygen gas, and their recombination to bromate ion. The reaction of BrO2 ion with oxygen atoms produced thermally or by γ-rays is proposed to account for the recombination and, hence, for the annealing of the chemical radiation damage. The yields of the radiolytic products were dependent upon the nature of the cation of the salt but were independent of the dose rate.

    Author Information:

    Chase, John W.
    Oak Ridge National Laboratory, Oak Ridge, Tenn.

    Boyd, George E.
    Oak Ridge National Laboratory, Oak Ridge, Tenn.

    Committee/Subcommittee: E10.07

    DOI: 10.1520/STP44633S