And for those with a geiger counter, you can (or rather, its decay products). One key point is that you must run air through it for a couple of hours, then measure immediately, as some decay products have a half-life in minutes.
And for those with a geiger counter, you can [detect radon in your A/C filter](http://tuxgraphics.org/npa/radon-detection-geiger-counter-radioactive-hvac-filter/) (or rather, its decay products). One key point is that you must run air through it for a couple of hours, then measure immediately, as some decay products have a half-life in minutes.
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