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My lab has a few radioactivity labels about, but we don't use any radioactive materials. There is one room on our floor that has a chamber.
I ought to do a sweep of our floor with a Geiger counter, just for the heck of it. Yeah, I am going to do that. A few days later one man broke open the iridium window, which allowed him to see the caesium chloride emitting a deep blue light. Oh God no.