This is not the only method for measuring the amount of radon coming from the granite but it is the most economical.
Brazilian granite radon.
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.
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It is possible for any granite sample to contain varying concentrations of uranium and other naturally occurring radioactive elements.
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.
Radon that originates in the soil is the main cause of radon problems the epa says.
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.
The reports were about granite countertops that contain radium which can emit radon a radioactive gas that can cause lung cancer.
The epa says that approximately one of every 15 homes throughout the country whether new or old has elevated radon levels.
Color and uranium content.
Granites can be black gray pink or red depending on the colors of the constituent minerals.