Start Dating techniques that

Dating techniques that

Uranium-thorium dating, also called thorium-230 dating, uranium-series disequilibrium dating or uranium-series dating, is a radiometric dating technique commonly used to determine the age of calcium carbonate materials such as speleothem or coral.

At secular equilibrium, the number of thorium-230 decays per year within a sample is equal to the number of thorium-230 produced, which also equals the number of uranium-234 decays per year in the same sample.

That means that the play was without fail written after (in Latin, post) 1587.

The same inductive mechanism is applied in archaeology, geology and paleontology, by many ways.

In this relative dating method, Latin terms ante quem and post quem are usually used to indicate both the oldest and the most recent possible moments when an event occurred or an artifact was left in a stratum.

But this method is also useful in many other disciplines.

Uranium-thorium dating has an upper age limit of somewhat over 500,000 years, defined by the half-life of thorium-230, the precision with which we can measure the thorium-230/uranium-234 ratio in a sample, and the accuracy to which we know the half-lives of thorium-230 and uranium-234.

Note that to calculate an age using this technique the ratio of uranium-234 to its parent isotope uranium-238 must also be measured.

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