FIELD: isotope separation. SUBSTANCE: separation is accomplished in four cryogenic-rectification packed column and four homomolecular isotope-exchange assemblies. Two raw material streams are processed, the first one containing 0.80-0.99 at. parts protium and 0.01-0.20 at. parts tritium and the second one containing 0.01-0.03 at. parts protium, 0.64-0.72 at. parts deuterium, and 0.25-0.35 at. parts tritium. Process gives protium, deuterium, and tritium products with isotopic purities 0.99999, 0.9999, and 0.9999 at. parts, respectively. EFFECT: increased isotope separation efficiency. 1 dwg, 1 tbl
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