FIELD: recovery of spent fissionable fuel. SUBSTANCE: method used in complex process schemes for extraction and recovery of irradiated nuclear materials or wastes produced earlier as result of such processes and prepared for disposal and also in extraction and concentration of rare-earth elements involves extraction of mentioned elements by means of extraction mixture doped with monoalkyl phosphoric acids such as monobutyl phosphoric acid. EFFECT: enhanced factor of separation of rare-earth and transplutonium elements. 5 cl, 3 tbl
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