There are no 500-megaton weapons. There was only---once---a 50-megaton device. There are 500-kiloton weapons, and these are used for ICBMs, but the danger radius is not 80 miles. (The whole subject of risk is a sliding scale. There are various radii for different criteria.)
Your right, too many zeros. 50 MT
3rd degree burns estimated at the 100km (65 miles)mark. Shock wave 465 miles. The blast wave circled the earth 3 times.
I did estimate 80 miles as a somewhat distance to not experience damage.
But the 50-MT device was not a practical weapon. Even 10-MT weapons have been retired. More effective to use multiple lower-yield weapons, once delivery accuracy improved. "Damage" depends on overpressure tolerance, or bare skin.
There are no 500-megaton weapons. There was only---once---a 50-megaton device. There are 500-kiloton weapons, and these are used for ICBMs, but the danger radius is not 80 miles. (The whole subject of risk is a sliding scale. There are various radii for different criteria.)
Your right, too many zeros. 50 MT 3rd degree burns estimated at the 100km (65 miles)mark. Shock wave 465 miles. The blast wave circled the earth 3 times. I did estimate 80 miles as a somewhat distance to not experience damage.
But the 50-MT device was not a practical weapon. Even 10-MT weapons have been retired. More effective to use multiple lower-yield weapons, once delivery accuracy improved. "Damage" depends on overpressure tolerance, or bare skin.