Of the atomic bomb blast in Japan, during WW II, what is the distance from one side of the blast to the other?

Question

Specificaly from the boiling clouds on the earth surface rather than the altitude.

What would be the ratings in terms of killotons?

How would that same distance compare to a plutonium bomb?

Answer 1

The Hiroshima bomb was constructed with approximately 135lbs of U-235 material. The blast equivilent was approximately 13 kilotons. It exploded 600 meters ( 2000 ft ) above the city with only 1.38% of it's material fissioning instantly killing an estimated 90,000 people.

The radius of total destruction was about 1.6 km (1 mile), with resulting fires across 11.4 square km (4.4 square miles).

Infrastructure damage was estimated at 90% of Hiroshima's buildings being either damaged or completely destroyed.

Hope this helps you.

Answer 2

Depended on terrain. My maps show: Nagasaki "Very Severere Damage from Blast and Fire out to about 1 mile radius, moderate out to 2 miles in some directrions, partial damage to about 5. Hiroshima ranges were 1, 2 and 3 respectively. At the time, the bombs were estimated at 20KT equivalent. The details convince me that I don't want one going off in my neighborhood.