Abstract
Previous experiments on the use of iodine to scavenge radicals produced in hydrocarbons by gamma rays have been extended to the heavy particle radiations available at the Brookhaven 60-inch cyclotron. It has been shown that at beam currents of the order of 10/sup -9/ ampere depletion effects can be avoided in millimolar iodine solutions and that significant radical yields can be determined. Hexane, cyclohexane, and 2,2,4-trimethylpentane were studied. In experiments with 18-Mev deuterons (LET = 0.5 e.v./A) and with 33-Mev helium ions (LET = 2 e.v./A) the observed yields are approximately 10 and 30% less than those found in similar fast electron experiments. This decrease in radical yield is somewhat less than observed in similar comparisons of the effect of light and heavy particles on aqueous systems. (auth)
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