Fission products are as deadly as neutron-activated cobalt in the first week or two following detonation, after a month to six weeks, the fission products from a thermonuclear weapon decay to levels tolerable by humans.
Fission products are as deadly as neutron-activated cobalt in the first week. This was after a month to six weeks to levels tolerable by humans. Fission products are as deadly as neutron-two following detonation. This was after a month to six weeks to levels tolerable by humans. Six weeks are the fission products from a thermonuclear weapon decay.