Most homeowners worried about radon gas are focused on the basement, where the cancer-causing gas can seep from the earth. But should they also be concerned about their kitchen's granite countertops?
The Houston Chronicle has raised the issue, focusing attention on research by Rice University Professor W.J. Llope, who found that some granite countertops "generate gamma radiation and radon gas at a level that is considered dangerous by the U.S. government."
Radon has been a recognized carcinogen for at least three decades. It achieved widespread attention during the "energy crises" of the 1970s, when homeowners improved the energy efficiency of their homes to save money. However, with fewer drafts creating ventilation, scientists worried that a build up of the odorless, colorless gas could lead to a rise in lung cancer cases.
Radon is the leading cause of lung cancer among non-smokers. Radon is the second-leading cause of lung cancer in America, and claims about 20,000 lives annually, according to the Environmental Protection Agency.
But should you be concerned that radon gas is seeping from your expensive granite countertops? Absolutely not, replies the marble industry, whose member companies make granite countertops.
In a statement, the Marble Institute of America (MIA) blasted the Rice study and others as junk science and said there is no credible evidence that radon gas released from granite countertops pose any kind of risk.
"While natural minerals such as granite may occasionally emit radon gas, the levels of radon attributable to such sources are not typically high," the MIA says, quoting what it said is an EPA statement.
"EPA believes the principal source of radon in homes is soil gas that is drawn indoors through a natural suction process."
The New York Times notes that, while allegations that granite countertops may emit dangerous levels of radon and radiation have been raised from time to time, the claims have mostly been made by companies that make or distribute competing countertop materials.
