RADIATION-INDUCED REACTIONS IN THE ETHANOL MONOCHLOROBENZENE DOSIMETER SOLUTION

Using gamma radiolysis, electron pulse radiolysis, laser flash photoly sis and endproduct measuring techniques the basic radiation chemical p rocesses taking place in the ethanol-chlorobenzene dosimeter (composit ion: 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 m easure the absorbed dose, forms by dissociative electron capture of ch lorobenzene yielding Cl- ions (90%) and by Cl atom elimination from ne utral excited chlorobenzene molecules (10%). In both reactions phenyl radicals are left behind, which predominantly abstract H atom from eth anol 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 co ncentration relation.