In the movie Godzilla at one point the scientists discover a residue of Strontium-90 in Godzilla's footprint. In the ensuing report to the Diet a scientist announces that this is evidence that Godzilla's undersea home was perturbed by a hydrogen bomb.
This would seem to conflict with the Wikipedia article on Strontium-90 which says that the isotope is a product of nuclear fission, not nuclear fusion. Since a hydrogen bomb is a weapon that depends on nuclear fusion, and no mention of nuclear fusion is made in the Wikipedia article, I am wondering if Strontium-90 is found also in detritus of hydrogen bomb explosions and, if so, by what mechanism that occurs.