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When the fuse is triggered, a conventional explosion causes the second subcritical mass to be propelled at a high velocity into the first subcritical mass.
She watched the reactor output climb until the drive was subcritical .
In a fission bomb, the fuel must be kept in separate subcritical masses, which will not support fission, to prevent premature detonation.
At 20°C the solution has a critical point at ionic strengths of ~ 13 mM and becomes increasingly subcritical as the ionic strength is lowered.
The most obvious was the gun assembly technique, in which two subcritical masses of enriched uranium were explosively driven and held together until nuclear fission began and was sustained.
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