Radon
Radon is a chemical element with the symbol Rn and atomic number 86. It is a radioactive, colorless, odorless, tasteless noble gas. It occurs naturally in minute quantities as an intermediate step in the normal radioactive decay chains through which thorium and uranium slowly decay into lead and various other short-lived radioactive elements. Radon itself is the immediate decay product of radium.
Characteristics
Radon is one of the densest substances that remains a gas under normal conditions. It is also the only gas under normal conditions that only has radioactive isotopes, and is considered a health hazard due to its radioactivity. Intense radioactivity has also hindered chemical studies of radon and only a few compounds are known.
Occurrence
Radon is usually found at low levels in soil, rock and water, and it can be released into the air. The gas can accumulate in buildings, especially in confined areas such as attics and basements. It can also be found in some spring waters and hot springs.
Health effects
Exposure to radon can cause lung cancer and is the second leading cause of lung cancer after cigarette smoking. The risk of lung cancer increases with the concentration of radon and the length of exposure. Radon is responsible for about 21,000 lung cancer deaths every year in the United States.
Measurement and mitigation
Methods of radon testing and mitigation are very effective and can reduce radon levels to below the recommended action level. The Environmental Protection Agency recommends that all homes be tested for radon.
See also
References
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Radon
Radon spectrum
Radon decay in a cloud chamber
Decay chain (4n+2, Uranium series)
Radon apparatus
Lead 210 in air at Japan
Radon Concentration next to Uranium Mine
Radon Lognormal distribution
US homes over recommended radon levels
Stanowisko pomiaru radonu glebowego wf pw
Radioactive Seeds
Uranium waste near Rifle, Colorado
Radon detector
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