Wiley InterScience Backfile Collection 1832-2000
Chemistry and Pharmacology
Liquid toluene was irradiated with 60Co γ-rays, with protons of energies from 1.8 down to 0.5 MeV and with α-particles of 1.5 and 0.7 MeV with a dose of 10 and 30 Mrad at 20-25°C. The G-values increased with increasing LET from 0.11 to 0.58 for hydrogen, from 0.95 to 1.55 for polymers, from 0.055 to 0.061 for bibenzyl, from 0.034 to 0.042 for bitolyls, 0.020 to 0.066 for benzyltoluene and 0.028 to 0.051 for benzyldihydrotoluene. The isomer ratio of the six bitolyls changed appreciably but the ratio of the three benzyltoluenes remained constant. The yield vs. LET dependence shows different characteristics for the different products formed. The competition of reactions of first and second order with respect to primary reactive species are discussed. The results approve the hypothesis that benzyltoluene is mainly formed by a second order reaction of reactive primary particles in the spurs. If this molecule formation would be due to a radical recombination, then a small spur-radius must be accepted for this reaction.
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