Idaho National Lab is just up the road and bit West. LOTS of fun stuff out there, including some things dropped or shot during WW2 which didn't go "BANG!" But I figured about 10kg of U235 in two 5kg lots slammed together fast oughta do it. Not much, maybe 0.8KT nominal yield, but REALLY REALLY dirty.

Maybe I'll stick the parts down one of the holes in Yellowstone and see what happens. I'm always up for some scientifical experimenting. Maybe I'll discover a new energy source or something. I'll have to get someone else to do the sticking because I'll have to do the measuring and figgering part.