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Definition of "nuclear yields " (US DoD)

The energy released in the detonation of a nuclear weapon, measured in terms of the kilotons or megatons of trinitrotoluene required to produce the same energy release. Yields are categorized as follows: very low less than 1 kiloton; low 1 kiloton to 10 kilotons; medium over 10 kilotons to 50 kilotons; high over 50 kilotons to 500 kilotons; very high over 500 kilotons. See also nominal weapon; subkiloton weapon.