Radon that originates in the soil is the main cause of radon problems the epa says.
Brazilian granite radon.
Ok so the risk from granite is minuscule but how common is radon in u s.
Does the epa believe there is a danger of radon gas or associated radiation being emitted from granite countertops.
Color and uranium content.
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.
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.
Granites can be black gray pink or red depending on the colors of the constituent minerals.
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.
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The epa says that approximately one of every 15 homes throughout the country whether new or old has elevated radon levels.