For Radon we have terms and definitions in 13 topics. The topics are Air Quality, Construction, Energy, Environment, Environmental Toxins, Explosives, Health, Home, Housing, Medical, Purchasing A Home, Real Estate and Speleological.

A colorless, naturally occurring, radioactive, inert gaseous element formed by the radioactive decay of radium atoms in soil or rocks
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A naturally-occurring, heavier than air, radioactive gas common in many parts of the country. Radon gas exposure is associated with lung cancer. Mitigation measures may involve crawl space and basement venting and various forms of vapor barriers.
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A naturally occurring radioactive gas found in the United States in nearly all types of soil, rock, and water. It can migrate into most buildings. Studies have linked high concentrations of radon to lung cancer.
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A colorless naturally occurring, radioactive, inert gas formed by radioactive decay of radium atoms in soil or rocks.
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A radioactive gas produced by the decay of one of the daughters of radium. Radon is hazardous in unventilated areas because it can build up to high concentrations and, if inhaled for long periods of time, may cause lung cancer.
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(Rn), gaseous radioactive element, discovered by Ernest Rutherford in 1899. A colorless, chemically unreactive Inert Gas, it is the densest gas known. Highly radioactive (emitting alpha rays), it is used chiefly in the treatment of cancer by radiotherapy. In homes and other buildings in some areas of the U.S. radon produced by the radioactive decay of uranium-238 present in soil and rock can reach levels regarded as dangerous, but the seriousness of the problem is unclear.
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A colorless, naturally-occurring, radioactive, inert gas formed by radioactive decay of radium atoms in soil or rocks.
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A colorless, odorless gas that is emitted from soils, rocks and water as a result of radioactive decay in certain areas of the country. Radon is known to cause cancer. Homes should be tested for radon. The local environmental agency should be consulted on its handling, removal and any applicable laws.
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A radioactive gas found in some homes that, if occurring in strong enough concentrations, can cause health problems.
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A colorless, odorless, tasteless radioactive gas that is produced by materials in soil, rocks, and building materials; suspected of causing cancer
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A radioactive gas which seeps up from the ground. It may be found in some homes, and if it is in sufficient concentration, then it can cause health problems. A radon test is often part of the home inspection.
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A naturally occurring gas that is suspected of causing lung cancer.
National Safety Council on Radon
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A radioactive inert gas (Rn86 half life 3.8 days) formed continuously in the earth's interior by radioactive decay. Densest of all known gases, tends to collect in caves as well as man made cellars etc. Concentration varies greatly between localities.
Geology.
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