Iodine capture technologies

A satisfactory disposal form requires that the material may be easily made from the iodine capture technology in place, and that it be resistant to and stable at the conditions imposed by transportation and storage and disposal environments. Temporary storage does not appear to be a problem. Transportation requirements are minimum for 1Z9I requiring only proper labeling and transportation on sole-use vehicles. 

Based on this screening and consideration of the products of the iodine capture technologies, Agl, Cul, Pblo, Ba(I0o)2> Ca(I03)2 Pb(I03)2 Hg(I0o)2, iodine-loaded silver moraenite (AgZI) and iodine-loaded lead zeolite X (PbXI) were selected for incorporation into cement and subsequent leach testing. 

Iodine Immobilization Three different waste forms were proposed for 1-129 in the 1980s (Trevorrow et al., 1983). Two of these utilized zeolites for capture. Two of the final waste forms incorporated cement into the system for immobilization and the third consisted of pellets. As Trevorrow et al. (1983) stated in their report "The very small release limit for 1-129 specified by 40 CFR 190 (Table 14.10) makes extreme demands on technologies of collection and retention for this nuclide. Furthermore, the assessment of whether the technologies will comply with this limit is affected by uncertainties such as the distribution of iodine in the plant or the efficiency of the technology for collecting 1-129 from gas streams" (Me Kay, 1980). 

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