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There are 39 known isotopes of radon (86 Rn), from 193 Rn to 231 Rn; all are radioactive.The most stable isotope is 222 Rn with a half-life of 3.8235 days, which decays into 218 Po
Radon mostly appears with the radium/uranium series (decay chain) (222 Rn), and marginally with the thorium series (220 Rn). The element emanates naturally from the ground, and some building materials, all over the world, wherever traces of uranium or thorium are found, and particularly in regions with soils containing granite or shale , which ...
At that time, radon only referred to the isotope 222 Rn, whereas the names actinon and thoron denoted 219 Rn and 220 Rn, respectively. [7] In 1957, the International Union of Pure and Applied Chemistry (IUPAC) promoted the name radon to refer to the element rather than just 222 Rn; this was done under a new rule concerning isotope naming ...
Radon compounds are chemical compounds formed by the element radon (Rn). Radon is a noble gas, i.e. a zero-valence element, and is chemically not very reactive. The 3.8-day half-life of radon-222 makes it useful in physical sciences as a natural tracer. Because radon is a gas under normal circumstances, and its decay-chain parents are not, it ...
220 Rn: 220 Rn Tn Thoron, Thorium Emanation α 55.6 s 6.404 216 Po: 216 Po ThA Thorium A α 0.145 s ... 222 Rn: 222 Rn: Rn Radon, Radium Emanation
Radon is responsible for the majority of public exposure to ionizing radiation. It is often the single largest contributor to an individual's background radiation dose, and is the most variable from location to location. Radon gas from natural sources can accumulate in buildings, especially in confined areas such as attics and basements.
This page lists radioactive nuclides by their half-life.
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