Of a fissile material (235U or 239Pu),
the minimum mass needed for a sustained nuclear chain reaction,
as in an atomic bomb.
→ critical; → mass.
An amount of → fissile material that by its mass or geometry is
incapable of sustaining a
→ fission → chain reaction.
→ subcritical; → mass.
© 2005-2021 by M. Heydari-Malayeri