METHOD OF SULFUR ISOTOPES PRODUCING Russian patent published in 1999 - IPC

FIELD: radiochemistry. SUBSTANCE: sulfur hexafluoride of natural isotope composition is subjected for separation by method of gaseous centrifugation. Fraction SF₆ (content of ³³S is 99.3%) is fed to an interaction with elemental iron at 430-630 C at Fe excess 50-100% above stechiometry and residue of SF₆ is frozen out. Products of interaction are treated with 18-20% HCl. Evolved H₂ and H₂S are treated with solution containing K₃Fe(CN)₆ and K₂CO₃, hydrogen is utilized and precipitate is filtered off, washed out and dried. Content of ³³S in sulfur powder is 99.3%. For preparing ³²S, ³⁴S, ³⁶S the corresponding fractions of SF₆ are fed to interaction with iron after centrifugation. Enrichment degree is 99%, not less. Invention can be used in medical-biological investigations and in devices of technical control. EFFECT: improved method of producing. 2 cl, 1 ex