not that much megaton nuke , this is study on castle bravo a mere 15mt nuke
The
Bravo fallout plume spread dangerous levels of radioactivity over an area over 100 miles (160 km) long, including inhabited islands. The contour lines show the cumulative radiation
exposure in
roentgens (R) for the first 96 hours after the test.
[3] Although widely published, this fallout map is not perfectly correct.
[31]
by the way that explosion later resulted in production of B-41 nuclear bomb which was a more powerful 25 mega ton device and only weight 4.5 ton
by the way that's nothing by the crippled AN-602 explosion by USSR (they cripple the bomb to produce half the yield) that bomb shattered glasses 780km away and all building (brick or wooden ) in a village 55km away get destroyed and hundreds of km away wooden house get destroyed and stone house lost their roof and
the explosion could cause third degree burn 100km away from the explosion site by the way windows were broken up to 900km away
by the way total destruction radius superimposed on Paris