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The radiation-induced reaction between iodine and n-heptane has been studied with a view to its use in the q.uantita.tive determination of free radical production in the radiolysis of liquid hydrocarbons. The yield of this reactIOn has been found to be nearly independent of iodine concentration and of temperature of the sample. The reaction is inhibited by the presence of dissolved oxygen. For each mole of hydrogen produced 0.6 mole of iodine is absorbed which indicates that free radical production is a major component of th~ over-all process. The primary decomposition yield is of the order of 10 bonds broken per 100 ev of absorbed energy.

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