Radon meaning

rā'dŏn
The definition of radon is a gas that comes from the element radium.
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Radon is the second leading cause of lung cancer in the United States.
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It is generated from the radioactive decay of uranium.
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Radon is the heaviest inert gas that naturally occurs.
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The half-life of radium is about 3.5 days and, since radon is produced when it decays, large amounts of radon can build up rapidly.
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In every square mile of surface soil, down to the depth of six inches, one gram of radium occurs naturally.
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The seven ways that radon seeps into your structure include cracks in solid floors, construction joints, gaps in suspended floors, gaps around service pipe feedholes, cracks in walls, water supply or cavities inside walls.

An example of radon is when radon gas seeps into a building through the floors, causing health concerns including lung cancer.

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A colorless, radioactive, inert gaseous element formed by the radioactive decay of radium, that is used in radiotherapy and to produce neutrons for research. Its most stable isotope is Rn-222 with a half-life of 3.82 days. A natural source of radiation found in most soils and groundwater, radon poses a serious health threat if inhaled. Atomic number 86; melting point −71°C; boiling point −61.7°C; density of gas 9.73 grams per liter; specific gravity (solid) 4.
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A radioactive, gaseous chemical element, one of the noble gases, formed, together with alpha rays, as a first product in the atomic disintegration of radium: symbol, Rn; at. no. 86
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A colorless, radioactive, inert gaseous element that is formed by the radioactive decay of radium and is used to produce neutrons for research. Its most stable isotope is Rn-222 with a half-life of 3.82 days. A natural source of radiation found in most soils and groundwater, radon poses a serious health threat if inhaled. Atomic number 86; melting point −71°C; boiling point −61.7°C; density of gas 9.73 grams per liter; specific gravity (solid) 4; symbol Rn.
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A colorless, odorless, radioactive element in the noble gas group. It is produced by the radioactive decay of radium and occurs in minute amounts in soil, rocks, and the air near the ground. Radon is used as a source of radiation for the treatment of cancer and other diseases. Its most stable isotope is Rn 222 with a half-life of 3.82 days. Atomic number 86; melting point −71°C; boiling point −61.8°C; specific gravity (solid) 4.
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A radioactive chemical element (symbol Rn, formerly Ro) with atomic number 86, one of the noble gases.
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Origin of radon

Contraction of radium emanation, since the element appears in the radioactive decay of radium.