The previous poster - which I was replying to with that in mind - talked about unmanned robots, though... I'm guessing you mean the robot would also not be coming out.You don't come OUT of the Quarantine Zone. The guard force tries to stop anyone from getting in, and generally succeeds, but they won't chase someone past the inner wall perimeter. You get in, you're in. You won't get out. Too hazardous for everyone outside the walls.
There are all sorts of valuable things in the ruins, gold bullion, jewelry, lots of items that collectors would pay through the nose to acquire. Not going to be coming out, not for a few thousand years.
I forgot what exactly you had Berlin and Nuremberg doused in - is there really no way to decontaminate small items?