All known nuclear weapons created thus far run primarily on nuclear fission, with gen 2 nuclear weapons such as the hydrogen bomb using a hybrid form of fission with a limited amount of fusion. Pure fusion hasn't yet been mastered (that we know of) and doesn't cause long lasting nuclear fallout the same way fission does.
All known nuclear weapons created thus far run primarily on nuclear fission, with gen 2 nuclear weapons such as the hydrogen bomb using a hybrid form of fission with a limited amount of fusion. Pure fusion hasn't yet been mastered (that we know of) and doesn't cause long lasting nuclear fallout the same way fission does.