Buzzword: Radon
What it is. Radon is a colorless, odorless radioactive gas that results from the natural decay of uranium in soil and rock. The gas moves up from the ground and can diffuse into the air or enter a home, typically through cracks and holes in the foundation or concrete slab. (Radon can also enter the home through well water and by way of some building materials). The presence of radon in the home can pose a danger to your health, according to the Environmental Protection Agency. In fact, radon is the second leading cause of lung cancer in this country.
Why the buzz? Radon has been in the news recently with reports that some granite countertops can release dangerous levels of radon. This isn't a new claim—it surfaced in the 1990s—and it's fairly controversial. In April 2008, BuildClean, a nonprofit that aims to educate consumers about safe and healthy building materials, made news when it announced that its pilot project would provide free in-home radon testing of 300 homes in Houston to determine whether granite countertops emit harmful levels of radon. It's worth noting that two big makers of quartz countertops, Cambria and Cosentino (which also sells granite counters), are the sole funders of BuildClean. "By its nature, granite emits radon—the second leading cause of lung cancer in the U.S.," said Sara Speer Selber, BuildClean's president, in a press release at the time.
Next, in early May, W.J. Llope, Ph.D., a senior faculty fellow at the T.W. Bonner Nuclear Laboratory at Rice University in Houston, released a report in which he analyzed 18 articles covering 95 granite samples. In "Radiation and Radon from Natural Stone" (PDF download), Llope reported that 92 of the granite samples emitted no or very little radon, though two were in the 3.1-to-3.4 picocuries per liter (pCi/L) range, and one registered 4.2. (These measurements assume a hypothetical unventilated room, not a standard home, according to Llope's study.) The EPA estimates that the average indoor radon level is 1.3 pCi/L and suggests that you reduce radon when the level in your home is 4 pCi/L or higher.























