I have a radon meter (the Aranet) and have been messing around with putting it in my display case where I keep my radioactive things (higher reading in there!) and so on. In a closed plastic box with a bit of uranium ore or an old radium dial clock it will go offscale high in a few days. I wondered about getting a radon decay chain spectrum on my Radiacode but just the gas in a box, even if it's a lot of radon by the standards of a basement, is not that much. I got some random aquarium-filter-grade activated carbon and left it in a little box with an old clock for a few days and I was not expecting it to be as hot as it is, bury the radiacode in it and get 1.5 kcpm. I'm accumulating a spectrum now.
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