RADIATION-INDUCED REACTIONS IN THE ETHANOL MONOCHLOROBENZENE DOSIMETER SOLUTION

Using gamma radiolysis, electron pulse radiolysis, laser flash photolysis and endproduct measuring techniques the basic radiation chemical processes taking place in the ethanol-chlorobenzene dosimeter (composition: 24 vol% chlorobenzene, 4 vol% water, 0.04 vol% acetone, 0.04 vol% benzene and 71.92 vol% ethanol) were investigated. The HCl, used to measure the absorbed dose, forms by dissociative electron capture of chlorobenzene yielding Cl- ions (90%) and by Cl atom elimination from neutral excited chlorobenzene molecules (10%). In both reactions phenyl radicals are left behind, which predominantly abstract H atom from ethanol molecules producing alpha-hydroxy-ethyl radicals and benzene. The yield of the dimer, tetramer, etc. chlorobenzene molecules is small, which is important from the aspect of the linearity of the dose-HCl concentration relation.