Gamma radiolysis of NaCl brine: Effect of dissolved radiolysis gases on the radiolytic yield of long-lived products |
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Authors: | M Kelm E Bohnert |
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Affiliation: | Forschungszentrum Karlsruhe, Institut für Nukleare Entsorgung, Postfach 3640, 76021 Karlsruhe, Germany |
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Abstract: | Five moles per litre NaCl solution is γ-irradiated in autoclaves at 35 °C and 90 °C. H2, O2 and are formed as long-lived products and reach equilibrium concentrations at a gas partial pressure of some 10 bar. Since formation of a gas phase is completely suppressed, H2 and O2 are kept dissolved. The equilibrium concentration level depends on dose rate and pH. Experiments at 90 °C and with added H2 show no gas production at all. From the kinetic simulation of the experiments we deduce that the reaction of OH and radicals with H2 limits or inhibits sustaining solution decomposition. If species are present which compete with the radicals for H2, (such as Br−) the decomposition is promoted. In such a case the gas partial pressure exceeds 100 bar. |
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Keywords: | F0700 R0600 U0200 W0200 |
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