Chemical Evidence of Track Effects in the Radiolysis of Liquids

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Abstract
The influence of several parameters on the spatial distribution of free radicals in an irradiated liquid is discussed theoretically. Two methods for the experimental study of track effects in liquids are considered: (1) free radical chain reactions initiated by X- and gamma-radiation show no evidence of tract effects presumably owing to the comparatively long lifetime of the active chain carriers. (2) Track effects are demonstrated in a kinetic study of free radical scavenging using diphenylpicrylhydrazyl as a scavenger in chloroform and methyl acetate solutions. Analysis of the kinetic data gives information on the relative concentration of free radicals in the [image]back ground[image] and in the expanding track. With X- and gamma-rays, track effects appear only at low radiation intensities where overlapping of expanding tracks is small. At higher intensities the free radical distribution during the reaction is almost uniform.

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