Granites can be black gray pink or red depending on the colors of the constituent minerals.
Brazilian granite radon.
It is possible for any granite sample to contain varying concentrations of uranium and other naturally occurring radioactive elements.
This is not the only method for measuring the amount of radon coming from the granite but it is the most economical.
Ok so the risk from granite is minuscule but how common is radon in u s.
The health physics society after testing several samples of commercial granite concluded that the radon produced by a typical granite countertop would be about 30 times lower than the level laid out in the epa guidelines.
Some granite countertops have been found to give off trace amounts of radon and reporters cited a few kitchens with radon levels as high as 25 times the epa s safety limit of 4 picocuries per liter of.
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Does the epa believe there is a danger of radon gas or associated radiation being emitted from granite countertops.
What about radon and radioactivity in granite countertops.
The us epa recommends taking corrective measures for radon levels at or above 4 pci l the us epa encourages you to consider reducing your radon levels for readings between 2 and 4.
The reports were about granite countertops that contain radium which can emit radon a radioactive gas that can cause lung cancer.