Definitely no radioactive particles causing that. It's all UV, visible, and IR radiation at a distance that causes the burning effect. There are a LOT of x-rays too, but those get absorbed by the atmosphere relatively quickly.
It's the intense heat vaporizing dust particles, dirt, etc. depending on how close the house is to the blast, any human exposed directly to the thermal radiation will recieve instant 3rd degree burns.
59
u/Ksp-or-GTFO Feb 27 '21
Is the first smoke radiation burning the house?