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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 ...
Rn. Here is a typical deposition rate of 210 Pb as observed in Japan as a function of time, due to variations in radon concentration. [4] Radon concentration in the atmosphere is usually measured in becquerels per cubic meter (Bq/m 3), which is an SI derived unit.
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 ...
This page lists radioactive nuclides by their half-life.
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It does not really make sense to credit Dorn's discovery of 222 Rn as the discovery of Rn the element. 220 Rn had previously been discovered by Rutherford and Owens in 1899, and Dorn even cites them in his paper: "Nach RUTHERFORD nimmt die durch ThO 2 erregte sekundäre Aktivität ziemlich langsam mit der Zeit ab und sinkt in etwa 11 Stunden ...