“…To the best of the authors' knowledge, the detailed reports regarding the oxide characteristic effects on H 2 production are only few. Some limited data about the dependence of oxide surface area on H 2 production yields are available for water vapor adsorbed on ZrO 2 powder surface [3], water containing TiO 2 powder [4], and SiO 2 powder [5]. For the study of powder characteristics on g-radiolysis, aluminum oxide is a suitable material because it has many types of alumina powders to have various crystal structures and specific surface areas [6].…”