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While radon is the second most frequent cause of lung cancer, it is the number one cause among non-smokers, according to EPA policy-oriented estimates. About 2,900 of these deaths occur among people who have never smoked. According to the United States Environmental Protection Agency (EPA), radon is the second most frequent cause of lung cancer, after cigarette smoking, causing 21,000 lung cancer deaths per year in the United States. Radon is a contaminant that affects indoor air quality worldwide. Įpidemiological studies have shown a clear link between breathing high concentrations of radon and incidence of lung cancer. It is possible to test for radon and use techniques such as sub slab depressurization for mitigation. Climate change may cause radon previously trapped underground to be released as permafrost thaws, particularly in areas like the Arctic, Alaska, Canada, Greenland and Russia. Radon can also occur in some ground water like spring waters and hot springs.
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A common source is uranium-containing minerals in the ground, and therefore it accumulates in subterranean areas such as basements. It is often the single largest contributor to an individual's background radiation dose, but due to local differences in geology, the level of exposure to radon gas differs from place to place. Unlike all other intermediate elements in the aforementioned decay chains, radon is, under standard conditions, gaseous and easily inhaled, and therefore a health hazard. The decay of radon produces many other short-lived nuclides, known as "radon daughters", ending at stable isotopes of lead. Since thorium and uranium are two of the most common radioactive elements on Earth, while also having three isotopes with half-lives on the order of several billion years, radon will be present on Earth long into the future despite its short half-life. Its most stable isotope, 222Rn, has a half-life of only 3.8 days, making it one of the rarest elements. Radon itself is the immediate decay product of radium. It occurs naturally in minute quantities as an intermediate step in the normal radioactive decay chains through which thorium and uranium slowly decay into various short-lived radioactive elements and lead. It is a radioactive, colourless, odourless, tasteless noble gas. Radon is a chemical element with the symbol Rn and atomic number 86.