radon testing meters

https://www.google.com/maps/d/u/9/1t1cYTM2iK36WUmxOXh63cbfQdoRrlQMo&ll=36.16574394382697%2C-86.89803435546878&z=12

It's produced from the malfunction of uranium in dirt and also rocks. It in some cases gets concentrated in residences built on dirt with all-natural uranium deposits. It can enter buildings through cracks in floors