Radiation Protection in Cyclohexane

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Abstract
The 100 ev yield of H2, G(H2), from liquid cyclohexane irradiated by either Co60 gammas or 1.5 Mev electrons is 5.85. Addition of I2 causes decrease to a plateau value G(H2)~3.8 at 3 x 10-2 [image] I2. Addition of benzene (C6H6 or C6D6) to the latter solution causes G(H2)to rise to a maximum value ca. 4.05 at ca. 0.2 electron percent benzene; the increased H2 production is entirely from the cyclohexane. At higher benzene concentrations, G(H2) decreases. Iodine protection against radiolysis appears to involve dissociative electron capture by I2, while benzene appears to act by excitation transfer. Scavenging of free H atoms does not appear to account for the results observed in either case. Bromobenzene, methyl iodide, cyclohexyl iodide and ethyl iodide all decrease 100 ev yield of H2 but the process has not been elucidated. At least three excited states appear to be involved in radiolysis of cyclohexane.

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