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Radon in Granite and in Concrete


 

There has been concern about the possibility of granite counter tops or granite tile raising the radon levels or emitting Gamma radiation

There is also typically some radium in concrete.  In almost all cases this does not contribute significantly to the indoor radon levels.

There has been an increased interest in the radon emanation from granite used for countertops and tiles in homes. Radon originates from naturally occurring uranium present in granites and other building materials made from stone. The radon emanation rate of granite, along with the home’s volume and ventilation rate determines its contribution to room radon.

The EPA recommends remediating radon when the indoor-air level of radon is 4 picocuries per liter (pCi/L) or higher. The EPA also says that radon levels below that can still pose a health risk and recommends that you consider remediation when the level is above 2 and under 4 pCi/L. The average indoor radon level is about 1.3 pCi/L, and for outside air its about 0.4 pCi/L.

Potomac Homes can measure the radon levels from granite for $250 with two sets of two monitors (6 hours) and from concrete  for $250 with two sets of two monitors (48 hours).

 
 
 
 

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Last modified: 03/01/2016


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