Uranium-Thorium dating is based on the detection by mass spectrometry of both the parent U and daughter Th products of decay, through the emission of an alpha particle.
The decay of Uranium to Thorium is part of the much longer decay series begining in U and ending in Pb. With time, Thorium accumulates in the sample through radiometric decay.
The method assumes that the sample does not exchange Th or U with the environment i. The method is used for samples that can retain Uranium and Thorium, such as carbonate sediments, bones and teeth. Ages between andyears have been reported.
Journal of Quaternary Science U-Th ages obtained by mass spectrometry in corals from Barbados: sea level during the pastyears. Calibration of the 14C timescale over the past 30, years using mass spectrometric U-Th ages from Barbados corals.
Uranium series dating of impure carbonates: an isochron technic using total sample dissolution. Geochimica et Cosochimica Acta Quaternary Science Reviews Atmospheric radiocarbon calibration beyond 11, cal BP from Lake Suigetsu.
Radiocarbon Pleistocene extinction of Genyornis newtoni: human impact on Australian megafauna.
Uranium series dating of Quaternary deposits. Quaternary International 1: Non-destructive gamma spectrometric U-series dating. A computer program for radiocarbon age calibration.
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Continuous ,year climate record from vein calcite in Devils Hole, Nevada.
Lecture 15 U Th Pb 1