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The decay-chain of uranium-238, which contains radium-226 as an intermediate decay product. 226 Ra occurs in the decay chain of uranium-238 (238 U), 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.
Radium (88 Ra) has no stable or nearly stable isotopes, and thus a standard atomic weight cannot be given. The longest lived, and most common, isotope of radium is 226 Ra with a half-life of 1600 years. 226 Ra occurs in the decay chain of 238 U (often referred to as the radium series). Radium has 34 known isotopes from 201 Ra to 234 Ra.
Radon-222 (222 Rn, Rn-222, historically radium emanation or radon) is the most stable isotope of radon, with a half-life of approximately 3.8 days. It is transient in the decay chain of primordial uranium-238 and is the immediate decay product of radium-226.
Download as PDF; Printable version; ... 218 At, 223 Ra, 224 Ra, 225 Ra, and 226 Ra. 217 Rn and 221 Rn are produced in rare branches in the decay chain of trace ...
226 Ra is the most stable isotope of radium and is the last isotope in the (4 n + 2) decay chain of uranium-238 with a half-life of over a millennium; it makes up almost all of natural radium. Its immediate decay product is the dense radioactive noble gas radon (specifically the isotope 222 Rn ), which is responsible for much of the danger of ...
This radiation is a small portion of the total emitted during radium 226 decay. Radium 228 emits beta particles, and is also a concern for human health through inhalation and ingestion. The gamma rays emitted from radium 226, accounting for 4% of the radiation, are harmful to humans with sufficient exposure.
A sample of radioactive material in equilibrium produces a steady and steadily decreasing quantity of radioactivity as the isotopes that compose it traverse the decay chain. On the other hand, if a sample of radioactive material has been isotopically enriched, meaning that a radioisotope is present in larger quantities than would exist if a ...
The most stable isotope is 222 Rn (half-life 3.82 days), which is a decay product of 226 Ra, the latter being itself a decay product of 238 U. [41] A trace amount of the (highly unstable) isotope 218 Rn (half-life about 35 milliseconds ) is also among the daughters of 222 Rn.