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Radon-222 itself alpha decays to polonium-218 with a half-life of approximately 3.82 days, making it the most stable isotope of radon. [1] Its final decay product is stable lead-206 . In theory, 222 Rn is capable of double beta decay to 222 Ra, and depending on the mass measurement, single beta decay to 222 Fr may also be allowed.
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 is a chemical element; it has symbol Rn and atomic number 86. It is a radioactive noble gas and is colorless and odorless. Of the three naturally occurring radon isotopes, only 222 Rn has a sufficiently long half-life (3.825 days) for it to be released from the soil and rock
), which is the most common naturally occurring isotope of uranium. It undergoes alpha decay to radon-222, which is also radioactive; the decay chain ultimately terminates at lead-206. Because of its occurrence in the 238 U decay chain, 226 Ra exists naturally at low concentrations in uranium-containing minerals, soil, and groundwater. [3]
2.1 thorium-222: 2.237 uranium-215: 2.24 polonium-190: 2.46 fluorine-29: 2.5 flerovium-284: 2.5 bismuth-208m: 2.58 radium-202: 2.6 boron-19: 2.92 seaborgium-258: 3 hassium-266: 3.02 fermium-244: 3.12 protactinium-222: 3.2 francium-214m1: 3.35 neon-31: 3.4 protactinium-217: 3.48 neon-32: 3.5 darmstadtium-277: 3.5 protactinium-211: 3.8 lead-179: ...
1.2 Beta particles. ... Radon exposure in workplaces other than mines ... Radon-222 is a gas produced by the α-decay of radium-226.
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After 11 half-lives (42 days), radon radioactivity is at 1/2 000 of its original level. At this stage, the predominant residual activity is due to the radon decay product 210 Pb, whose half-life (22.3 years) is 2 000 times that of radon, and its descendants 210 Bi and 210 Po, totalling 0.03% of the initial seed activity. [citation needed]