Patent Number: 052522580
Section: claims

1. A method for recovering radioactive iodine from an off-gas generated when spend nuclear fuel is being reprocessed, which comprises passing the off-gas through a scrubbing solution capable of dissolving the radioactive iodine to separate the radioactive iodine from the off-gas, adding a compound to the scrubbing solution which forms a precipitate with the radioactive iodine dissolved in the scrubbing solution, and freeze drying the scrubbing solution containing the precipitated radioactive iodine. 2. A method according to claim 1 wherein the scrubbing solution contains sodium hydroxide. 3. A method according to claim 2, wherein the compound contains cooper ion or silver ion. 4. A method according to claim 1, wherein the product obtained on freeze drying is mixed with a naturally occurring iodine-containing compound and the mixture is mineralized by the application of high pressure in a high pressure press.