I’ve heard people say there is no fallout, but there typically is a fission bomb in the secondary stage. Where does its radiation go? Is it just blown away by the fusion bomb so it’s no longer as deadly? Isn’t it still there though? Is it just weaker?
In: Physics
The majority of the yield from most hydrogen devices comes from fission of the uranium tamper. They just include fusion, they’re not primarily fusion.
They still produce fallout, and likely a lot more than some pure fission bombs. It’s possible to reduce fallout (Tsar Bomba detonated without the tamper and was something like 97% fusion), but it would dramatically reduce the yield (50% in this case).
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