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Related to subcritical mass: supercritical mass
subcritical mass[¦səb′krid·ə·kəl ′mas]
A piece of fissionable material having an effective multiplication constant of less than one, so that it does not give rise to a self-supporting chain reaction.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.