The effects of aluminum surface on I -oxidation under gamma irradiation were investigated. Without irradiation, only O 2 oxidized I -at pH \ 2, and aluminum expedited the oxidation reaction. With irradiation, the radiolysis products from water and air oxidized I -into I 3 À : At pH \ 2, O 2 generated by water radiolysis additionally oxidized I -. However, at pH [ 6, the H 2 O 2 radiolysis product reduced I 3 À into I -. A smaller amount of I 3 À was observed in pH 1.9 and 3.3 solutions in contact with aluminum under irradiation because oxidants preferentially oxidize aluminum rather than I -. Moreover, for pH \ 6.0, even less I 3 À was formed by aluminum exposed to air because air radiolysis products also preferentially oxidized aluminum.
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