Enjoy those bananas! Radioactive Potassium 40 in every bite!
link for some other examples:
http://www.seattlepi.com/national/167212_radiation01.html"Cocoa powder, like bananas, has potassium 40 in it," he said. "It's not harmful to humans, but it does set the detectors off. There are lots of things around us every day that have radiation in them. We even had a shipment of toilet tanks set off a detector once."
Porcelain, it turns out, has a bit of thorium and uranium in it.
Other weird things on the list: granite, which has a hint of thorium and uranium; camping lanterns, with thorium; propane, with radium 226; Brazil nuts, with potassium 40; kitty litter, with thorium and potassium 40; pottery, with uranium and thorium.
"We're rapidly learning what the normal radiological world looks like," Mercer said. "Nobody was really looking at that very hard before (Sept. 11, 2001) -- now we're finding many new things."