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Water with a radon concentration of 10 4 pCi/L can increase the indoor airborne radon concentration by 1 pCi/L under normal conditions. [78] However, the concentration of radon released from contaminated groundwater to the air has been measured at 5 orders of magnitude less than the original concentration in water.
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.
By mass, polonium-210 is around 250,000 times more toxic than hydrogen cyanide (the LD 50 for 210 Po is less than 1 microgram for an average adult (see below) compared with about 250 milligrams for hydrogen cyanide [80]). The main hazard is its intense radioactivity (as an alpha emitter), which makes it difficult to handle safely.
The EPA estimates that if 1,000 people who do not smoke are exposed to 4 pCi/L of radon over a lifetime of 70 years, about seven could develop lung cancer as a result.
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 ...
Radon goes further towards metallic behavior than xenon; the difluoride RnF 2 is highly ionic, and cationic Rn 2+ is formed in halogen fluoride solutions. For this reason, kinetic hindrance makes it difficult to oxidize radon beyond the +2 state. Only tracer experiments appear to have succeeded in doing so, probably forming RnF 4, RnF 6, and RnO 3.
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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