FIELD: gas fluoride treatment of spent nuclear fuel. SUBSTANCE: in order to produce saturated fluorides, high-temperature diffusion and fluorine radical fluorination mode is initiated by using readily inflammable agents in fluorine which are previously applied onto reaction surface. Thermal decomposition of some higher fluorides is suppressed due to equilibrium shift in zone with predetermined temperature gradient and enriched with fluorine and gas suspension of fluorides is passed through cooling zone. EFFECT: more efficient preparation method. 4 cl, 7 dwg, 1 tbl
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