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A fission weapon: Subcriticality before the device is supposed to be detonated, supercriticality when it is. This is normally achieved by slamming two subcritical blocks of fissile material together using conventional explosives, to create one supercritical block which will sustain a fission reaction.

A fusion weapon: these normally involve stages of fission reactions as above, which finally create an environment that can sustain nuclear fusion of hydrogen isotopes, which releases far more energy, relatively speaking, than fission.

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15y ago

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