Radiolysis of aqueous solutions with pulsed helium ion beams Yield of (SCN)2-formed by scavenging OH as a function of SCN-concentration

Abstract

The concentration dependence of G[(SCN)₂^-] in the radiolysis of aqueous KSCN solutions with pulsed 24 MeV He²⁺ ions has been measured. The yield increased with increasing concentration below 0.1 mol dm^-3, and in the measured concentration range the yield for 21 MeV He²⁺ was smaller than for an electron beam. The results have been compared with the reported G_OH derived from various scavengers. The data did not agree at high scavenging capacity. It was suggested that the product yields do not equal G_OH because part of the products disappear by intra-track reactions at high scavenging capacity particularly in high linear energy transfer (LET) radiolysis. It was confirmed qualitatively by the deterministic diffusion kinetic calculations.