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There has been a lot of recent media focus on the potential for granite countertops, a big selling feature for many homes the last few years, to be the source of elevated radon levels. The media stories have alarmed many homebuyers and homeowners concerned about potential health hazards for their families. But what is the real risk?
Granite is a natural mineral formed by earth's geology. It is mined and used to produce various building products, such as countertops. It is well know in the scientific industry that any particular sample of granite may contain varying concentrations of uranium, which produces radon gas, and hence may contribute to indoor radon levels.
While granite countertops and other products may emit radon gas in some cases, past studies have indicated that the general levels of radon attributable to such sources are not typically high. The principal source of radon in homes is still thought to be radon gas that is drawn indoors from soils surrounding a home through a natural process. But the EPA notes there are too many variables to generalize about the potential health risks inside a particular home that has a granite countertop.
To address potential radon concerns in any home, the EPA has consistently recommended that all homes be tested for radon in the air. There are easy ways to test the air in your home for radon. If needed, high radon levels can be reduced with proven and reasonably inexpensive technology.
Common Radon Screening Devices
Be aware, however, that conventional radon screening methods are designed to only test the air for radon levels. To test whether a building product such as a granite countertop or floor is a source of radon in a home requires a different type of testing by a specially-trained and qualified professional with the appropriate equipment.
The key to reducing risk is to start with an air test for radon and then an appropriate decision can be made about any additional testing or actions that may be required or desired. Learn more about radon by reading the EPA’s Citizen's Guide to Radon at www.epa.gov or Health Canada’s Guide: Radon, What You Need to Know at http://www.hc-sc.gc.ca/.
For more information on radiation and countertops, go to www.epa.gov/radiation. The American Assiociation of Radon Scientists and Technologists (AARST) has addressed the issue in its Position Statement on Granite Countertops and Radon Gas (hps.org).
Remember, these tips are only general guidelines. Since each situation is different, contact a professional if you have questions about a specific issue. More home safety and maintenance information is available online at www.housemaster.com.
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