Atomic Energy Society of Japan

For PVA-KI gel, the phenomenon of returning to transparent by heating PVA-KI gel colored red by X-ray irradiation was measured using an ultraviolet-visible spectrophotometer at 290 nm, 360 nm, and 490 nm. Based on the results obtained by time-resolved measurement of absorbance, reaction kinetic analysis was performed, the reaction model was considered, and the rate constant was determined.