The problem with breathing the stuff is that it may stay with you for quite a while. This isn't the worst thing with gamma radiation since most radiation will j

The problem with breathing the stuff is that it may stay with you for quite a while. This isn't the worst thing with gamma radiation since most radiation will just pass through the body, but beta or alpha radiation could be worrying if that's still present (I don't know if it is, but disturbing the ground in Chernobyl and breathing the resulting dust doesn't sound like the safest way to find out)