Absorbed dose effect on radiolysis of cyclohexene

The radiation chemical yield of hydrogen from irradiated cyclohexene is independent of the dose up to nearly 200 Mrad, whereas those of 1,3-butadiene, 1,3-cyclohexadiene and trans-1,3-hexadiene decrease with increasing dose. This can be explained by radical scavenging as well as by charge and excitation transfer. Equations have been calculated for the description of dose dependence of the yields of these three conjugated dienes. The significant influence of conjugated dienes produced from monoalkenes on the radiolysis has been reconfirmed. Irradiations were carried out using a 60Co γ-irradiation facility with a nominal activity of 80000 Ci, at a temperature of 30-35degC. The dose rate was equal to 1.5 Mrad h-1, the dose applied ranged from 6 to nearly 200 Mrad. (F.G.)