A Rock Solid Investment
The minerals present in granite and other naturally occurring rocks
make them have a small amount of radioactivity present in them.
As does some concrete and gypsum (drywall) products.
"Calculations show that, for an average countertop, containing an average uranium concentration of four (4) ppm (parts per million), the concentration of radon that is given off by the countertop into the household air is 270,000 times less than the level of radon in the outside air."
(Quoted from Marble Institute of America flyer)
The US EPA states it simply in Consumer's Guide to Radon Reduction "In a small number of homes, the building materials can give off radon, although these rarely cause radon problems by themselves. In the U.S., radon gas in soils is the principal source of elevated radon levels in homes."
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Bathroom showers and tubs