1957 5 Aug. 4/2 If General Electric scientists can develop an efficient plutonium enrichment process, the demand for plutonium will be increased.
1971 40 341 Preferential evaporation of uranium oxides causes plutonium enrichment in the neighborhood of the central cavity.
1991 June 134/2 The core is divided into two areas of plutonium enrichment—fuel assemblies with 21% enrichment on the outside and those with 16% on the inside.