FIELD: processing of radionuclide contaminated materials, namely, spent ion-exchange resins used for extracting nuclides from contaminated water. SUBSTANCE: ion-exchange resins are treated with 5-12 M solution of nitric acid in autoclave at 250 C. In processing anion- and cation-exchange resins, the former is treated first with nitric acid of 12 M concentration and then cation-exchange resin is treated by solution formed in the process with nitric acid concentration of 8-9 M. Oxidation product of ion-exchange resins has small volume. EFFECT: reduced mass of ion-exchange resins. 2 cl, 1 tbl
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