トリチウムガスの酸化に及ぼす紫外線の影響 : トリチウムガスの酸化過程

概要

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For the UV-photon induced oxidation of tritium gas, an experimental kinetic equation in the previous paper did not agree with a theoretical equation derived from possible elemental reactions. In the present study, we examined in detail the dependence of the reaction rate on the total pressure of the hydrogen isotope, [H2]+[HT], and HT fraction, [HT]/([H2]+[HT]). The initial reaction rate was proportional to the fraction of [HT]/([H2]+[HT]) and one-half order with respect to [H2]+[HT]. Based on these results in addition to oxygen pressure dependence, the rate equation is given as {Formura} OH and/or H radicals appeared essential to the enhancement of the oxidation rate, although the observed rate equation could not be explicitly derived from theoretical considerations. The increase in OH radical in troposphere owing to that in air pollution materials such as NOx is considered capable of accelerating the rate of formation of tritiated water in the presence of UV-photons.
富山大学の論文