Irradiation Yields of Radicals in Gamma-Irradiated Ice at 4.2° and 77°K

Abstract

The EPR spectra of both ice and deuterated ice which have been subjected to γ irradiation at 4.2°K are presented and discussed. Experimental radical irradiation yields at 4.2°K are reported for the H2O system as a function of sustained irradiation dosage. A comparison between the irradiation yields at 4.2° and 77°K is given and the resulting similarities discussed in terms of intra-spur reactions. Finally, preliminary evidence is presented for the existence of an appreciable isotope effect for the irradiation yields in a mixture of H2O and D2O.