Abstract
Abstract γ-radiolysis of boiling water has been investigated. The G -value of H 2 evolution was found to be very sensitive to the purity of water. In high-purity water, both H 2 and O 2 gases were formed in the stoichiometric ratio of 2:1; a negligible amount of H 2 O 2 remained in the liquid phase. The G -values of H 2 and O 2 gas evolution depend on the dose rate: lower dose rates produce larger yields. To clarify the importance of the interface between liquid and gas phase for gas evolution, the gas evolution under Ar gas bubbling was measured. A large amount of H 2 was detected, similar to the radiolysis of boiling water. The evolution of gas was enhanced in a 0.5 M NaCl aqueous solution. Deterministic chemical kinetics simulation elucidated the mechanism of radiolysis in boiling water.
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