Thorium uranium dating

Uranium is often found in trace amounts in certain types of rock and is radioactive.

U-Th ages obtained by mass spectrometry in corals from Barbados: sea level during the past 130,000 years. By Aimee Komugabe Uranium series (U-series) dating is based on the uranium and thorium radioactive decay chains.These decay chains involve a series of different elements and may be as long as 35 steps, before reaching the stable end product – lead.Because these elements (and their isotopes) all have different half-lives, elements with longer half-lives will be present in greater quantities than those with shorter half-lives.Therefore, when equilibrium is disrupted (for example when a mineral breaks down leading to gain or loss of uranium and/or thorium), we can calculate the degree to which equilibrium has been restored between parent and daughter isotopes.

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