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depleted uraniumnuclear reactorisotopeuraniumradioactive isotopefissile materialprotiumuranium seriesdeuteriumisotopic tracertransuranium elementcarbon-14tritiumcobalt-60
Key People

Harold C. Urey
American chemist

Philip Hauge Abelson
American scientist

John R. Dunning
American physicist

Arthur Jeffrey Dempster
American physicist