Evaluation of weathered impregnated charcoals for retention of iodine and methyl iodide

The results are reported of a study to determine the effect of weathering and aging on the efficiency of some impregnated charcoals in absorbing and retaining halogens and organic halides. The purpose is to establish the optimum charcoal for use in the N Reactor confinement system. Charcoals exposed for six months in the Zone I ventilation system showed little change in the retention efficiencies for elemental iodine, but the methyl iodide retention was severely degraded in all cases. The loss of efficiency of methyl iodide retention was attributed to the accumulation of organic pollutants