I went through this when I was a teenager during Reagan's first term, and my parents when through it when they were teens during Kennedy.

This article tones it down to a dirty bomb, and the results closely resemble any natural disaster. Based on what I read about the 2020 fires in CA and Ore., I saw that roads were backed up, store shelves were hoarded, and infrastructure failed. And that was without contamination sticking to everything like and STI. Unless you can avoid evacuation and have done a meticulous job preparing -and- have a shelter, I don't think it is realistic to expect to survive a dirty bomb attack. I was truly, existentially scared when my Mayor announced that we should prepare for evacuation during the fires... because our freeways can't even handle rush-hour traffic. What was I supposed to do with two kids and pets and stores that were already picked clean from the pandemic? I've added more water jugs since (and a small trailer) but I have a low-level fear that no preparedness is going to work long term for something like a dirty bomb, that will eventually require relocation.