Granite Countertops - Some Evidence of Radon Concerns

• Recent concerns have surfaced in the media about the use of granite for kitchen countertops and the possible emission of radon and/or radiation. 

• Granite is a highly popular natural substance that is used for counters and other areas in the home because of its durability and beauty. Any material that is extracted from underground rock formations are potential radon sources and can be checked by placing test canisters near the countertop then sent to a testing lab for evaluation. The type of granite and colors that are more prone to emit higher levels of radon are the more exotic and expensive granite with red and brown veins. 

• What is Radon and what risk could it pose? Radon is a natural radioactive gas that comes from the earth's soil and rocks. Specifically, when uranium in the earth's crust decays, it produces radium, which in turn produces radon. Radon levels tend to be highest in basements since those areas are closest to the soil and rock. This odorless and colorless gas percolates through porous soils and then enters the air.

• Indoor areas are more of concern. Radon gas can enter the home through gaps and cracks in foundations and insulation. Around pipes, sumps, drains, and walls. Granite countertops are also potential sources of radon. Mike Kitto, at nyradon.org, describes the type of granite and colors that are more prone to emit higher levels of radon. In general, he states that the more exotic and expensive granite with red and brown veins carry more concerns than the black, white, and green types. Testing for radon is accomplished by placing canisters near the counters and/or in the basement of the home.