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What isotopes are commonly used for radiometric dating

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Lead isotopes are commonly used in dating rocks and provide some of the best evidence for the Earth's age. In order to be used as a natural clock to calculate the age of the earth, the processes generating lead isotopes must meet the four conditions of a natural clock: an irreversible process, a uniform rate, an initial condition, and a final condition. Dalrymple cites examples of lead isotope dating that give an age for the earth of about 4. Lead isotopes are important because two different lead isotopes Pb and Pb are produced from the decay series of two different uranium isotopes U and U. Since both decay series contain a unique set of intermediate radioactive isotopes, and because each has its own half-life, independent age calculations can be made from each Dalrymple The presence of a stable lead isotope that is not the product of any decay series Pb allows lead isotopes to be normalized, allowing for the use of isochrons and concordia-discordia diagrams as dating tools.
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Radiometric Dating: Methods, Uses & the Significance of Half-Life

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What is an isotope and how is it used in radiometric dating - Vote Company

All absolute isotopic ages are based on radioactive decay , a process whereby a specific atom or isotope is converted into another specific atom or isotope at a constant and known rate. Most elements exist in different atomic forms that are identical in their chemical properties but differ in the number of neutral particles—i. For a single element, these atoms are called isotopes. Because isotopes differ in mass , their relative abundance can be determined if the masses are separated in a mass spectrometer see below Use of mass spectrometers. Radioactive decay can be observed in the laboratory by either of two means: 1 a radiation counter e.
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Radioactive isotopes have a variety of applications. Generally, however, they are useful because either we can detect their radioactivity or we can use the energy they release. Radioactive isotopes are effective tracers because their radioactivity is easy to detect.
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