Probably not, actually.
The "dirty bomb" scenario is the one that is most likely to cause chaos, havoc, and panic, the terriorism trifecta.
Very small amounts of radioactive material, gathered from much more easily acquirable sources can result in large scale disruption of everyday life.
If I was at all good at keeping track of my training manuals, I could go on at some length about
accidental contaminations on which most of the scenarios are based.
See, this kinda shit goes down, I'm one of the people that's supposed to be running the wrong way. Sort of.
WMD is the current focus in disaster mental health response. Most of the folks that I have met at these trainings have taken it to get a day out of the office. I don't actually expect to see them out on a disaster ground in a hazard orange vest.
I know that I've posted this before, but if you want to have a better idea of what a dirty bomb attack is like,
rent this movie. It may come back around on HBO.