Radioiodine volatilization in the presence of organic compounds

The impact of organic compounds on iodine volatility was investigated under a range of postaccident chemical conditions expected in a reactor containm ent structure. The rate of production of volatile iodine was evaluated in t he presence of 10(-3) M concentrations of carbonyl, alkyl halide, and aroma tic compounds. A bench-scale apparatus, installed in the irradiation chambe r of a Gammacell, was used to measure the rate of iodine volatilization fro m 10(-6) to 10(-4) M CsI solutions with pH values from 5 to 9. The results indicated that organic compounds could be classified into groups, based on their distinct effects on iodine volatility iodine volatilization increased significantly, rep to two orders of magnitude, in the presence of carbonyl compounds and alkyl chlorides, while it decreased in the presence of aroma tic compounds. Gas phase speciation indicated that organic iodides dominate the airborne iodine species in the presence of carbonyl compounds and alky l halides.