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The retention of iodine by activated carbon was measured by tests simulating predicted conditions during power surge and lossof-coolant accidents. The iodine retention efficiency of carbon in the power surge test decreases significantly with on-line service in the confinement system, but remains higher than 99.85% after 3.8 years. Studies in the loss-of-coolant test are incomplete. Partial regeneration of the carbon in both tests increased the iodine retention efficiency. A facility with a 5 x 10 7 rads/hr 60 CO source for determining the effect of intense gamma radiation on methyl iodide adsorption, particulate filter media, and other materials is nearing completion.

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