Interesting, I hadn't heard about that one. A little bit more caution around the mysteriously steaming machine would have been wise, even if you don't know about radiation - they didn't just get close, but made camp around it, and possibly wore it while working.

The RTG in the accident was using Strontium-90; weapons-grade plutonium is actually not super lethal to handle, FYI. It's mainly an alpha emitter, so a good pair of gloves is enough. Unless you eat it. Then you're dead, same as Polonium.