in Bombs and rockets, Language

The technical term “supergrade” has had a pair of distinctly American meanings:

(a) A supergrade was the civilian equivalent of an Army general

(b) Supergrade is industry parlance for plutonium alloy bearing an exceptionally high fraction of Pu-239 (>95%), leaving a very low amount of Pu-240 which is a gamma emitter in addition to being a high spontaneous fission isotope

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