Submitted by something-stupid2134 t3_zhmf26 in askscience
mfb- t1_izp1kt9 wrote
Reply to comment by Oppie8645 in What is the difference between atomic, nuclear and hydrogen bombs? by something-stupid2134
A three-stage design: fission -> fusion -> fusion.
The original design had an uranium tamper which would have added another 50 MT from fission, but vastly increased fallout (and likely killed the crew dropping the weapon).
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