G temperature dependencies and the spur diffusion model of radiation chemistry

The effect of temperature (700F to 3500F) on the radiation-induced chemical change in acidic aqueous solutions was studied. Air saturated Fricke, deaerated Fricke, and air saturated ceric-cerous dosimeters were the solutions studied. The purposes of the study were to (1) develop experimental techniques necessary to give accurate, reproducible G(P) values, and (2) measure the effect of temperature on the primary radical and molecular yields. The primary molecular yields, G/sub H2/ and G/sub H2O2/ both increased with temperature. The value for G/sub OH/ was independent of temperature, and G/sub H/ decreased with temperature increases. The observed values were consistent with the spur diffusion model of radiation chemistry if the initial electron spur radius decreases with increasing temperature, with all other parameters constant. (DP)