Process for preventing ecological contamination due to radioacti

Compositions – Organic luminescent material containing compositions – Scintillating or lasing compositions

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55 72, 55 74, 423 2, 423 22, 423249, 423593, G21F 902

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active

040922650

ABSTRACT:
Radioactive ruthenium, molybdenum and technetium which are by-products of the fission of U.sup.235 are prevented from contaminating the environment during nuclear fuel reprocessing procedures by passing the radioactive ruthenium, molybdenum and/or technetium oxides over a trapping agent selected from the group consisting of alkaline earth compounds, lanthanide compounds and lead compounds at a temperature of over 500.degree. C. leading to the formation of nonvolatile ruthenates, molybdates and technetates. By this process volatile radioactive RuO.sub.4, MoO.sub.3 and Tc.sub.2 O.sub.7 are kept from escaping into the atmosphere during nuclear fuel reprocessing. The stable ruthenates, molybdates and technetates thus formed can then be easily isolated and contained during the period of maximum radioactive decay.

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patent: 3972837 (1976-08-01), Acres et al.

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