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    What's this?
The rising threat of radon
A silent killer lurks undetected in millions of homes across the United States, and winter is its peak season. Find out what you can do to stop it.

By

Russell McLendon
Fri, Jan 07 2011 at 11:00 AM
 5

Related Topics:

Contamination, Toxins & Chemicals
 
Earthquakes and volcanic eruptions demand our attention, but not all subterranean killers announce themselves so boisterously. One in particular is both sinister and stealthy, creeping into millions of homes across the United States every day and night, killing thousands of people each year.
 
Radon is the country's No. 2 cause of lung cancer, behind only cigarette smoke, and has a yearly U.S. death toll of about 21,000 people. It's a naturally occurring, radioactive gas that's colorless, odorless, tasteless and chemically inert, so it can easily go unnoticed in someone's house for years. The EPA estimates that about one in 15 American homes has elevated radon levels. 
 
How radon gets inside
Nearly all soil contains low levels of decaying uranium, which emits radon gas, although certain regions have more than others (see U.S. map below). It's normally harmless — groundwater absorbs some of the radon, while the rest floats to the surface and dissipates softly into the air.
 
The problems begin when rising radon hits the underside of a building. If it finds any cracks, seams or other openings, the lower air pressure inside sucks the radon through like a vacuum, often causing it to accumulate in enclosed, low-lying parts of a house such as basements and cellars. These gas pockets can build up to dangerously high densities over time, potentially even leaking into other rooms. Exposure is a year-round risk, but winter is typically the most dangerous time of year, since people often trap more of the gas inside by keeping their doors and windows closed.
 
Even if it can't squeeze past a building's foundation, radon can still sneak in with the water. Wells or public water supplies that use groundwater are especially at risk, since groundwater absorbs radon from soil and rocks, but surface-water supplies may also be contaminated. Radon in water poses a mild risk for stomach cancer when ingested, but the main threat is still inhaling it, which can happen after it's released from the water in the shower or at the sink.   
 
Granite countertops caused a stir recently when studies pointed out that granite can emit small amounts of radon. The EPA acknowledges this, but says radon from granite countertops is so miniscule that, in most cases, it's not dangerous. The majority of indoor radon gas still comes from soil, but the EPA recommends testing your home for radon regardless of its source.
  
Radon hotspots
The EPA produced the U.S. map below, which shows county-by-county radon levels for all 50 states. Zone 1 (red) counties have an average indoor screening level of more than 4 pico curies per liter, zone 2 (orange) counties have 2 to 4 pCi/L, and zone 3 (yellow) counties have 2 pCi/L or less. Click on the map to enlarge, and click here for more information.
 
 
Areas with large deposits of uranium, as well as granite, shale and phosphate, are likely to have higher levels of radon wafting up from the soil. The long-term use of phosphate fertilizers on cropland may also increase soils' uranium content, and therefore the risk of radon exposure. Still, the determining factor on whether airborne radon gets inside is ultimately a building's foundation. A house in Pennsylvania in 1984 that had the outrageously high radon level of 2,700 pCi/L was 100 feet away from another house, on the same soil and geologic formation, whose radon levels were normal. Well-built houses can be radon-free even in high-risk areas, and vice versa. That's why the EPA warns against relying on the map above to decide whether to worry about radon exposure. The only way to know for sure is to test your home.
 
radon test kitHow to test for radon
The easiest starting point is a do-it-yourself radon test kit (pictured at right), which you can find online, at a hardware store or other retail outlet. If you're buying or selling a home, however, you may want to hire a qualified radon tester to come by your house. Check with your state radon office for a list of qualified testers, or try one of the two national, privately run radon-testing programs.
 
But the cheapest way is usually to just do it yourself. There are two kinds of home radon tests: short-term and long-term. A short-term test remains in your home for two to 90 days, depending on the type, and is the fastest way to find out if you have a radon problem. But because radon levels often vary from day to day and season to season, short-term tests aren't always reliable. Long-term tests, such as "alpha track" or "electret" detectors, stay in place for more than 90 days, and generally give readings that more accurately represent your home's year-round average. If your short-term test reveals a radon level of 4 pCi/L or more, the EPA recommends doing either a short-term or long-term follow-up.
 
The average indoor radon level is about 1.3 pCi/L, and outdoors it's normally about 0.4 pCi/L. Congress' long-term goal of reducing indoor radon throughout the United States to outdoor levels still isn't practical in many cases, but most homes now can be at least brought down to about 2 pCi/L. Still, no radon is safe to breathe, and the EPA points out that any reduction in radon exposure reduces the risk of lung cancer.
 
radiation trefoilHow to handle a radon problem
So you've tested your house and it's brimming with radioactive radon gas. What should you do?
 
There are a variety of home renovations that can stop radon from leaking inside. For starters, you might want to contact your state radon office, which can connect you with qualified testers as well as contractors. Unless you're experienced with home renovations, the EPA suggests hiring a professional contractor to seal your house off since the repairs can be labor-intensive. It'll usually cost between $800 and $2,500, with an average price of about $1,200, the EPA estimates.
 
The EPA has compiled a comprehensive handbook for ridding your home of radon, the Consumer's Guide to Radon Reduction, which lists several methods, depending on a house's foundation type. Some radon-reduction techniques simply remove radon that's already entered, while others prevent it from entering in the first place; the EPA recommends the latter. The agency also has advice for selecting contractors, checking a contractor's work, buying or selling a home with radon in mind, and other topics.
 
For more information about radon, check out these useful links:
  • National Cancer Institute: Radon and Cancer
  • Agency for Toxic Substances and Disease Registry: Radon FAQs
  • EPA: Citizen's Guide to Radon
  • EPA: Consumer's Guide to Radon Reduction
  • EPA: Who Can Test or Fix Your Home?
  • EPA: State and Regional Contact Information
  • EPA: Granite Countertops
  • USGS: The Geology of Radon
 
Image credits
House: Jupiter Images
Radon map: U.S. Environmental Protection Agency
Radon test kit: Wyoming Department of Health
Radiation trefoil: U.S. Department of Energy
 
Editor's Note: This article has been updated since it first appeared Nov. 25, 2009.

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anonymous
Molly Jan 08 2011 at 11:26 AM
Hi, thanks so much for this article. My husband and I bought an 1840's home, back in May. The home already had a mitigation system installed, but we still chose to have the radon levels checked. The levels came back, within that low range that the government deems 'safe'. After reading this article I am concerned that perhaps we should be doing more to protect ourselves and our children from radon. Does anyone know if the mitigation systems work? Should we be doing more to try to keep the radon
.... More
out? I am wondering if that is even possible in such an old home. I am feeling kind of scared, as we saved a long time, and this was our dream home. I hope we didn't buy a health hazzard. :( thanks for your help!
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anonymous
Wrangler Wayne Jan 08 2011 at 8:55 AM

The alpha particles emitted by Radon gas are charged (He2+). Because of this, they cling easily to dust found on walls and in air filters. So, waiting till the dust has built up a little, then cleaning thoroughly, eliminates about 90% of this hazard. Homes that have an air space underneath the floor that allows for exterior air venting will eliminate this risk entirely.

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anonymous
radon oslo Dec 08 2010 at 5:51 AM

Radon gas has radioactive properties and can contribute to acute respiratory health risks, such as lung cancer (one in 20 will develop lung cancer due to elevated exposure1). This is especially true if you are a smoker or are exposed to second hand smoke on a consistent basis.

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anonymous
electronic cigarette Nov 20 2009 at 6:32 PM

this is a great site lots of good information radon is a scary thing

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anonymous
Gloria Linnertz Nov 16 2009 at 9:46 PM
Enter your comments hereRadon and Lung Cancer--Confident in My Ignorance We think we know about radon and lung cancer, but do we? Why was I so confident in my ignorance is the question I ask myself very often. In the months prior to my husband’s diagnosis of lung cancer, he mentioned to me that perhaps we should check our home for radon gas. Of course, I didn’t know anything about radon gas, but thought I did. I said that our home was relatively new—only twenty years old—and we had a tight
.... More
basement. I was confident in my ignorance! Because radon cannot be detected through our senses, the only way to know if this silent killer is intruding into your home is to test. Recognizing what we can’t see, taste or smell is the problem. In the year before his diagnosis, my husband Joe also said to me that he might have cancer. My husband had previously had two triple artery bypasses twenty years apart. Again, I said, you don’t have cancer; you have heart disease. I thought he was just worrying too much. I thought I knew but I didn’t. My husband Joe was a person to take preventive and safe measures. For 27 years he worked and exercised every day, kept a low fat, low cholesterol diet, and didn’t smoke. We had smoke detectors, carbon monoxide detectors, and fire extinguishers in our home; and we didn’t burn candles. Joe only lived six weeks after his diagnosis of lung cancer that had spread to his liver and bones. We had been living with a radon level of 17.6 picocuries per liter of air in our home for 18 years. Knowing the word radon and that it is a gas does not constitute knowledge of the element and its danger. You’ve heard the saying “A little knowledge can be dangerous.” I would change that to “A little knowledge can be deadly.” We, the general public, don’t know the facts. We must replace our limited knowledge with a full base of all the facts on radon. Dr. Bill Field, an American Academic Scholar and Professor in the Department of Occupational and Environmental Health and Department of Epidemiology within the College of Public Health at the University of Iowa, who has recently been appointed to the Advisory Board on Radiation and Worker Health by President Obama, stated that protracted radon progeny exposure is the seventh leading cause of cancer mortality in the United States and the leading environmental cause of cancer mortality. It is the leading cause of lung cancer deaths among non-smokers. Large and recent studies confirm that radon in homes increases lung cancer risks. Throughout our world up to 18% of the lung cancers can be attributed to indoor radon according to Professor Bill Angell, Chair of the Prevention and Mitigation Working Group of the World Health Organization’s International Radon Project. . Radioactive particles from radon gas are inhaled and attach to the air sacs in the lungs. These particles change the characteristic of the cells to cancer, and those mutated cells divide and multiply. Radon is a radioactive gas that emanates from rocks and soils and tends to concentrate in enclosed spaces like houses. Soil gas infiltration is the most important source of residential radon and is present in every home (except ones on stilts) because of the way our homes are built and designed. The analysis from recent studies in Europe, North America, and Asia indicates that lung cancer risk increases proportionally with increasing radon exposure according to the World Health Organization (WHO). There is no known threshold concentration below which radon is safe. On September 21, 2009 WHO, in view of the latest scientific data, released a reference level of 2.7 picocuries per liter of air (pCi/L) as a minimum level to minimize health hazards due to indoor radon exposure. Radon is easy to measure. Every home needs to be tested for radon because each home has its own individual footprint on the earth. The homeowner cannot rely on the results of surrounding houses in the neighborhood. A short term (3-7 days) and/or long term (3-12 months) test kit can be used. Radon professionals can also perform the test with electronic devices. Test kits can be obtained from the radon hotline at (785) 532-6026 or email at Radon@ksu.edu or Web site: www.sosradon.org. Radon test kits can also be purchased at the local hardware stores. It is easy to protect from radon gas. Addressing radon is important in new construction as well as existing buildings. Radon prevention strategies focus on sealing radon entry routes and using soil depressurization techniques to prevent the gas from entering the home. The cost is very reasonable. “How little it can cost to save a life!” is what I would say to someone who complained about the expense of a radon mitigation system installed by a licensed radon professional. I write this in memory of my husband Joe --who was so very dear to me—my friend, my partner, my companion, my love. I ask you to test your home for radon during this month of November—National Lung Cancer Awareness Month. If your level is above 2.7, spend that little extra money to help save a life. That life may be someone you love. October 22,2009 Gloria Linnertzseascape@htc.net 618 830 4660 618 Evansville Ave. Waterloo, IL 62298
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