large diffusion cloud chamber with radon gas double decaying

awesome demonstration of a massive diffusion cloud chamber with normal background radiation vs. americium 241 vs. the epic RADON 220 gas just wow ps: yeah, i know i accidentally said Radium 220 instead of Radon 220 once and that i said half time instead of half life a couple of times. sorry about that, i was just drained after that awesome day at the museum and thus, unable to concentrate properly.