The nature and yields of the products of the radiolytic oxidation of aqueous ethylene have been determined as a function of the [ethylene]-to-[oxygen] ratio and of pH. At very low doses a chain mechanism is indicated, but at doses above <tex-math>$10^{17}\ {\rm eV}/{\rm ml}$</tex-math> the data can be described in terms of nonchain reactions involving peroxy intermediates. Yields calculated from the proposed mechanism are in good agreement with the experimental data.

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