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Gamma radiation has been used to initiate the gas phase reaction between iodine and methane. Under appropriate conditions, the products are hydrogen iodide and the iodomethanes. The experiments were conducted over a range of temperature, concentration, and at two levels of total absorbed dose.The existence of a chain reaction is presumed, on the basis of G-values, which were as high as 7 x lo'. In view of the propensity of iodine as a radical scavenger, this high efficiency might seem surprising, but may be attributable to the known autocatalyic effect of iodine in substitution reactions.he laboratory preparation of methyl iodide and

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