Granite counter tops have become all the rage. Even I have them. Did you know they can be radioactive?!
http://consumerist.com/5028691/are-your-beautiful-granite-countertops-full-of-uranium-maybeA routine radon test revealed a surprise in Lynn Sugarman's kitchen a few years ago. Usually, radon is found in your basement ( underground deposits of uranium decay and produce the gas) — but when the radon specialist inspected Dr. Sugarman's house —he found radon in her kitchen.
From the New York Times:
“He went from room to room,” said Dr. Sugarman, a pediatrician. But he stopped in his tracks in the kitchen, which had richly grained cream, brown and burgundy granite countertops. His Geiger counter indicated that the granite was emitting radiation at levels 10 times higher than those he had measured elsewhere in the house.
Granite, even the stuff that is commonly used in kitchen countertops, can contain uranium or other radioactive elements. The granite in Dr. Sugarman's kitchen was especially "hot."
The E.P.A. recommends taking action if radon gas levels in the home exceeds 4 picocuries per liter of air (a measure of radioactive emission); about the same risk for cancer as smoking a half a pack of cigarettes per day. In Dr. Sugarman’s kitchen, the readings were 100 picocuries per liter. In her basement, where radon readings are expected to be higher because the gas usually seeps into homes from decaying uranium underground, the readings were 6 picocuries per liter.
...
“It’s not that all granite is dangerous,” said Stanley Liebert, the quality assurance director at CMT Laboratories in Clifton Park, N.Y., who took radiation measurements at Dr. Sugarman’s house. “But I’ve seen a few that might heat up your Cheerios a little.”
So what do you do if your suspect your granite is radioactive? Well, the NYT says that you can get some do it yourself radon kits from the Environmental Protection Agency, or your local hardware store. You could also choose to spend some money to have a professional come in. Expect to spend $20-$30 for a do it yourself kit, and $100 to $300 to have your countertop tested by a professional.
And another link/article:
http://www.chron.com/disp/story.mpl/metropolitan/5908630.htmlBe wary of granite that glows
Rice professor says countertops may be tainted with uranium
By ALLAN TURNER Copyright 2008 Houston Chronicle
July 25, 2008, 11:17PM
icon 121 Comments
3 Recommend
Share
icon Print
iconEmail
ADD TO DEL.ICIO.USDel.icio.us
ADD TO DIGGDigg
ADD TO TECHNORATITechnorati
Yahoo! Buzz
Last August, Consumer Reports magazine — ever alert to stylish trends among its affluent readers — pinpointed the growing popularity of natural stone countertops, demand for which had increased 5 percent annually for the previous five years. But for Rice University physics professor W.J. Llope, the article's title, "Countertops: The Hottest Rocks," carried an unsettling irony.
Some granite countertops, he says, contain high levels of uranium, which, by generating gamma radiation and radon gas, can endanger human health.
"Most stones, in terms of radioactivity, are relatively quiet," Llope said. "But there are a couple I have found that are insanely hot."
Using a Rice University spectrometer, Llope has examined 55 stones, representing about 25 varieties of granite purchased from Houston-area dealers. Some, he said, could expose homeowners to 100 millirems of radiation — the annual exposure limit set by the Department of Energy for visitors to nuclear labs — in just a few months.
Llope, who said he plans to publish his findings in a peer-reviewed journal, declined to name the most hazardous varieties of granite he has thus far examined. But he said dangerously radioactive varieties include striated granites from Brazil and Namibia.
As many as 1,600 varieties of granite from 64 countries are sold for household use in the United States. None of them is routinely tested for radioactivity.
Jim Martinez, spokesman for the Marble Institute of America, a trade group which also represents the granite industry, cited a University of Akron study that found granite varieties used in 85 percent of such countertops are safe.
Still, he said, his organization is assembling a panel of scientists to develop a protocol for testing granite for radioactivity. He said that panel should be in place by summer's end.
"There's been a lot of junk science passed off as real science," Martinez said. "We want to establish scientific standards and protocol that would allow consistent testing in a logical way."
The trade group said reports of granite's radioactivity have been sensationalized by competitors who market non-granite products.
Llope hailed the group's move to test granite as an important first step in ensuring customer safety.
"There should be some oversight in this," Llope said. "This is something the Environmental Protection Agency or the dealers or both of them should do. This isn't something customers should have to do, not something they should have to lay awake worrying themselves to death about. They need help."
The EPA, although it offers the public information on radon hazards, has no authority to regulate quality of indoor air.
Llope said the radioactive substances in granite, significantly uranium, pose a double threat to homeowners: radiation and radon gas. Radiation exceeding levels an individual routinely receives just living on Earth can contribute to cancer. Radon is second only to cigarettes as a cause of lung cancer. It is especially dangerous to smokers.
"Where you have radon," Llope said, "you have radiation."
Llope said that slabs of stone taken from the same quarry — even different sections of the same slab — may differ in radiation levels.
In addition to his study of granite purchased in Houston, Llope studied 20 peer-reviewed journal articles reporting on the results of radiation testing of 95 granite samples. Llope found three cases where the stones generated levels of radon deemed dangerous by EPA.
"I'm not claiming that people necessarily will get very sick or die of cancer within months," he said, "but if you spend 10 years in that kitchen there is a risk you may end up with cancer. It might or might not be attributed to granite. Who would know?"
Llope advised homeowners to test their granite countertops for radon. Inexpensive test kits can be found at hardware stores.
allan.turner@chron.com