A hundred milligram of UO
2 was irradiated in JRR-4 (burn up 0.017%) and dissolved in boiling 3 M-HNO
3 (20 ml) to study the behavior of fission-product iodine (
131I, 1 ng). During the dissolution, 8090% of the iodine volatilized together with
133 Xe. Zeolitel3X (4g) trapped completely the iodine in the dissolver off-gas. Blowing a NO
2 flow through the solution was effective for expulsion of the remaining iodine and finally 9095% of the initial iodine was removed from the solution with the aid of addition of KIO
3. The iodine species in the solution includes I
2, I
-, IO
3- (IO
4-), organic iodides and other unknown species. The expulsion operations caused the unknown species to increase in relative abundance. This tendency was also noticed for iodine of higher concentration in 3 M-HNO
3.
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