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The decay chain of 238 U is commonly called the "radium series" (sometimes "uranium series"). Beginning with naturally occurring uranium-238, this series includes the following elements: astatine, bismuth, lead, polonium, protactinium, radium, radon, thallium, and thorium.
The 4n+2 chain of uranium-238 is called the "uranium series" or "radium series". Beginning with naturally occurring uranium-238, this series includes the following elements: astatine, bismuth, lead, mercury, polonium, protactinium, radium, radon, thallium, and thorium. All are present, at least transiently, in any natural uranium-containing ...
234 U occurs in natural uranium as an indirect decay product of uranium-238, but makes up only 55 parts per million of the uranium because its half-life of 245,500 years is only about 1/18,000 that of 238 U. The path of production of 234 U is this: 238 U alpha decays to thorium-234. Next, with a short half-life, 234 Th beta decays to ...
decay branches of 40 K, 232 Th and 238 U. Together these decay chains account for more than 99% of the present-day radiogenic heat generated inside the Earth. Only geoneutrinos from 232 Th and 238 U decay chains are detectable by the inverse beta-decay mechanism on the free proton because these have energies above the corresponding threshold (1 ...
The decay chain from lead-212 down to lead-208, showing the intermediate decay products. In this example: 234 Th, 234m Pa,..., 206 Pb are the decay products of 238 U. 234 Th is the daughter of the parent 238 U. 234m Pa (234 metastable) is the granddaughter of 238 U. These might also be referred to as the daughter products of 238 U. [1]
It is transient in the decay chain of primordial uranium-238 and is the immediate decay product of radium-226. Radon-222 was first observed in 1899, and was identified as an isotope of a new element several years later. In 1957, the name radon, formerly the name of only radon-222, became the name of the element.
The method relies on two separate decay chains, the uranium series from 238 U to 206 Pb, with a half-life of 4.47 billion years and the actinium series from 235 U to 207 Pb, with a half-life of 710 million years.
206 Pb is the final step in the decay chain of 238 U, the "radium series" or "uranium series". In a closed system, over time, a given mass of 238 U will decay in a sequence of steps culminating in 206 Pb. The production of intermediate products eventually reaches an equilibrium (though this takes a long time, as the half-life of 234 U