Upon irradiation by (FF+n+γ), the G(HCN) value from the nitrogen-ethylene system increased with the rise in the pressure, while upon y and (n+γ) radiations it decreased. This pressure effect was explained in terms of the high concentration of the active species in the FF tracks. At a high pressure, Reaction (5) is considered to take place in the tracks;
&N_2^++e^-→2N\ ag5
\intertextAt low pressures, Reaction (6) predominates, as in the γ-ray radiolysis, over Reaction (5) even in the FF tracks,
&N_2^++C_2H_4→N_2+C_2H_4^+\ ag6
and nitrogen molecule cations do not contribute to the formation of hydrogen cyanide.
Radiolysis of the C0 2 -C 3 H 8 system by fission fragments (FF) was compared experi· mentally with those by r· and (n+r)-rays. Carbon monoxide formation was observed to reach maximum at 15',;' propane concentration with all three kinds of radiation. The G(CO) value was found consistently higher with FF than with r-and (n+r)-rays, whereas G(C 2 H 6 ) showed the opposite tendency in the difference between FF and the other radiations. The maximum G(CO) value obtained with FF was 6.7, while only 3.6 was attained with the other radiations.The difference between the radiolysis by FF and by the other radiations was ascribed to reactions taking place within the FF tracks. The rates of in-track reactions and the diffusion out of the tracks were estimated on the basis of Mozumder's track model. This estimation made it clear that, with the rise in the total pressure, CO formation could be expected to be enhanced by FF irradiation, with the reaction COi+e--CO+O coming to predominate over other reactions constituting the mechanism of C0 2 radiolysis.
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