> fusion bomb without the need for an atomic bomb primary. This would be a weapon with no radioactive signature Freeman Dyson in "Disturbing the Universe" says

> fusion bomb without the need for an atomic bomb primary. This would be a weapon with no radioactive signature Freeman Dyson in "Disturbing the Universe" says they worked on this concept but didn't achieve it, and it didn't look feasible, at least when the book was written. The device in the article had an atomic primary.