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Topic: Radon

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	Radon \| Indoor Air Quality \| Air \| US EPA
		Radon is a cancer-causing natural radioactive gas that you can’t see, smell or taste.
		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.
	www.epa.gov /iaq/radon (571 words)

	Radon - Wikipedia, the free encyclopedia
		Because of radon's rapid loss to air, radon is used in hydrologic research that studies the interaction between ground water, streams and rivers.
		Radon is a radiological poison and a carcinogen.
		Radon is a daughter product of the decay of uranium; Many phosphate deposits have 30 to 100 times the concentrations of uranium as typical soils.
	en.wikipedia.org /wiki/Radon (1414 words)

	Radon - MSN Encarta
		Radon, symbol Rn, colorless, odorless radioactive gaseous element that is the heaviest of the noble gases of the periodic table (see Periodic Law).
		Radon was discovered in 1900 by the German chemist Friedrich Ernst Dorn.
		Radon is heavier than air and can concentrate in basements and other unventilated indoor areas built into the ground.
	encarta.msn.com /encnet/refpages/RefArticle.aspx?refid=761570164 (421 words)

	Radon
		Radon is a colorless, odorless gas, a radioactive byproduct of radium.
		In summary, a radon atom in the air decays within a few days into its short-half-life radon daughters, which decay within about an hour; with these decays, three alpha particles are emitted, one by radon and two by its daughters.
		Whereas the predecessors to radon in the chain are solids and will not migrate far from their place in the soil, radon is a gas and can migrate through a few feet of earth.
	hyperphysics.phy-astr.gsu.edu /hbase/nuclear/radon.html (1104 words)

	Radon (Rn) - Chemical properties, Health and Environmental effects
		Radon occurs in the environment mainly in the gaseous phase.
		Radon levels in groundwater are fairly high, but usually radon is quickly released into air as soon as the groundwater enters surface waters.
		Radon has a radioactive half-life of about four days; this means that one-half of a given amount of radon will decay to other compounds, usually less harmful compounds, every four days.
	www.lenntech.com /Periodic-chart-elements/Rn-en.htm (399 words)

	Radon: Environmental Health in Minnesota
		Radon is not regulated in Minnesota, so it is up to homeowners to decide for themselves how much radon is acceptable in their home.
		Radon moves through a house by diffusion and natural air movements and it can be distributed by mechanical equipment such as a forced-air ventilation system.
		Early detection of elevated radon levels can help protect the homeowner's financial interests if the radon problem is due to construction problems and can allow the homeowner to take appropriate actions to lower the radon level and protect the health of their family.
	www.health.state.mn.us /divs/eh/indoorair/radon (1410 words)

	National Cancer Institute - Radon and Cancer: Questions and Answers
		Radon is a radioactive gas released from the normal decay of uranium in rocks and soil (see Question 1).
		Radon is the second leading cause of lung cancer in the United States and is associated with 15,000 to 22,000 lung cancer deaths each year (see Question 4).
		Radon is a radioactive gas released from the normal decay of uranium in rocks and soil.
	www.cancer.gov /cancertopics/factsheet/Risk/radon (1618 words)

	Home Buyer's and Seller's Guide to Radon \| Publications \| Radon \| Indoor Air \| Air \| US EPA
		Contact your state radon office to find out if these are available in your state.
		Radon in your home's water in not usually a problem when its source is surface water.
		Radon problems do vary from area to area, but the only way to know your radon level is to test.
	www.epa.gov /iaq/radon/pubs/hmbyguid.html (7780 words)

	ATSDR - ToxFAQs™: Radon
		Radon is used to predict earthquakes, in the study of atmospheric transport, and in exploration for petroleum and uranium.
		Radon has a radioactive half-life of about 4 days; this means that one-half of a given amount of radon will decay to other products every 4 days.
		Indoor radon levels are affected by the radium and uranium levels in soil, the porosity of the soil, the composition and condition of the foundation materials, and the ventilation rate of the room.
	www.atsdr.cdc.gov /tfacts145.html (883 words)

	Radon
		Radon is a radioactive element which exists as a gas.
		The national average radon activity in houses in the UK is 20 becquerels per cubic metre and this is associated with the life-time risk of lung cancer of 1 in 300.
		However, if radon is inhaled, the alpha particles generated by the daughters can cause harm to cells in the lungs and elsewhere.
	www.agius.com /hew/resource/radon.htm (440 words)

	There is no Safe Radon Level in Homes
		Because radon is nine times heavier than air, elevated radon levels build up in basements and on lower floors.
		Radon in homes is more concentrated and far more dangerous than outdoors - the National Academy of Sciences estimates that the outdoor radon causes only 800 out of the total of 21,000 lung cancer deaths caused radon in the US each year.
		This 5-year study proves that radon even at the low levels found in homes causes lung cancer and that the risk is proportional to the radon level.
	www.radonseal.com /radon-level.htm (1502 words)

	Radon Information from the Radiological Protection Institute of Ireland RPII
		Radon is a naturally occurring radioactive gas which originates from the decay of uranium in rocks and soils.
		When radon surfaces in the open air, it is quickly diluted to harmless concentrations, but when it enters an enclosed space, such as a house or other building, it can sometimes accumulate to unacceptably high concentrations.
		Radon decays to form tiny radioactive particles, some of which remain suspended in the air.
	www.rpii.ie /radon (283 words)

	Environmental Hazards in the Home - HSH Associates Library of Mortgage Information (Site not responding. Last check: 2007-11-02)
		Radon is a colorless, odorless, tasteless gas that occurs worldwide in the environment as a byproduct of the natural decay of uranium present in the earth.
		Radon that is present in surrounding soil or in well water can be a source of radon in a home.
		Radon source diagnosis and mitigation normally require skills, experience, and tools not available to the average homeowner; therefore, it is always prudent to consider the use of trained personnel.
	library.hsh.com /?row_id=77 (6799 words)

	It's Your Health - Radon
		Radon is a colourless, odourless, radioactive gas that occurs naturally in the environment.
		Radon gas can move through small spaces in the soil and rock upon which a house is built.
		Radon is measured in units called "becquerels per cubic metre." The most popular radon detectors are the charcoal canister, the electrets and the alpha track detector.
	www.hc-sc.gc.ca /iyh-vsv/environ/radon_e.html (990 words)

	Radon Gas
		Radon is an odorless, tasteless colorless Noble gas that is inert (non-reactive) that is found throughout the world in varying concentrations.
		Radon enters building structures as a soil gas that utilizes existing cracks in concrete floors or walls, open soil in crawl spaces, improperly or poorly sealed floor drains or pipe entry points in floor slabs.
		Radon is found in varying concentrations throughout the United States with moderate levels found in Oregon (generally under 40 picocuries of Radon per liter of indoor air).
	oregon.gov /DHS/ph/rps/radon/radon.shtml (539 words)

	Radon
		New concern regarding radon exposures is traceable to the discovery that there are more houses with high radon levels than previously realized and to the use of a new method of expressing and summing doses from partial body exposures, such as the lung dose from radon daughters (7-16).
		The use of average values of dose from natural background radon suggests that dose is rather uniform, whereas in fact radon levels vary markedly in different regions of the country, based on geologic factors, relations to mines and mine tailings, as well as levels of radium and radon in water supplies (29).
		Radon concentrations indoors will generally be highest in the basement or on the ground level since the major source is influx from the soil under and around the house.
	www.physics.isu.edu /radinf/radon.htm (5754 words)

	HPA \| Radon
		Radon is present in all parts of the UK, although the gas disperses outdoors so levels are generally very low.
		Small radon detectors can be sent directly to householders by post, and returned at the end of a three month period.
		The most effective way to deal with radon is to fit a 'radon sump' to a property to vent the gas into the atmosphere.
	www.hpa.org.uk /radiation/radon (410 words)

	RADON QUESTIONS AND ANSWERS
		Radon is formed by the natural radioactive decay of uranium in rock, soil, and water.
		Based on a National Academy of Science report, EPA estimates that radon in drinking water causes about 168 cancer deaths per year: 89 percent from lung cancer caused by breathing released to the indoor air from water and 11 percent from stomach cancer caused by consuming water containing radon.
		Because radon in indoor air is the larger health concern, EPA recommends that you first test the air in your home for radon before testing for radon in your drinking water.
	www.nsc.org /ehc/radon/rad_faqs.htm (6749 words)

	Article Understanding Radon
		Radon comes from the natural radioactive decay of radium and uranium found in the soil beneath the house.
		Radon levels in the soil range from a few hundred to several thousands of pCi/L. The amount of radon that escapes from the soil to enter the house depends on the weather, soil porosity, soil moisture, and the suction within the house.
		It may have measured a radon level that is two to three times the actual level you are exposed to, spending most of your time upstairs.
	www.discoverit.com /at/phi/article.html (2622 words)

	Chemistry : Periodic Table : radon : key information
		Radon is a decay product of the radium salts used in the luminous paint of the numerals.
		Recently, radon buildup in homes from the surrounding soil and rocks has become a safety issue and some areas around the world test homes for radon gas.
		Radon is present to a very small trace extent in the atmosphere and in principle could be obtained as a byproduct from the liquefaction and separation of air.
	www.webelements.com /webelements/elements/text/Rn/key.html (296 words)

	Radon Information
		Radon is a gas that comes from the breakdown of uranium in soil, rock and water.
		Radon is the second leading cause of lung cancer.
		Radon and radiation reference material is available from the Radiation and Health Physics home page.
	www.health.state.ny.us /nysdoh/radon/radonhom.htm (320 words)

	Open Directory - Science: Environment: Air Quality: Radon (Site not responding. Last check: 2007-11-02)
		Radon - The Invisible Intruder - Report from the Office of New York State Attorney General (1996) on the dangers of radon, testing, tips on reducing radon and selecting a contractor.
		Radon Progeny - A chart listing all of the decay products of radon gas in their order of appearance.
		Residential Radon and Lung Cancer Study - The latest and most substantial study ever on the link between radon and lung cancer (May, 2000) proves that residential radon causes cancer even at the low levels in homes.
	dmoz.org /Science/Environment/Air_Quality/Radon (532 words)

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