Hey they used box-cutters to commandeer planes to bring down 2 skyscrapers! Radioactive EXIT signs sounds like their getting pretty serious!
This is a lot of fear mongering. Only need to read the facts above, I researched. Wal Mart is not the only one with Exit signs..just they are singled out as targets for whatever reason.. as I checked the NRC. Land fills have improved over the years etc..Think what was buried out there Pre Land fills called “town dumps” in many states. Factory wastes etc investigated and movies made out of news stories over the years.
I remember I came across a guy who would enter a site talk about just this very subject a couple years back. He was out of England. Pretty detailed as well, so watched for him to come on (usually Monday) and notified authorities just in case. The person would talk about how to make a dirty bombs and the radius it would take to do damage etc. He would focus on compiling smoke detectors etc. Said he had done this and tested it. He was probably a nut case but... That is why this story sparked my interest.