Uranium-Thorium dating is based on the uranium decay series dating 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. The Uranium Decay Series Gamma Decays Not Shown. Journal of Quaternary Science Uranium decay series dating ages obtained by mass spectrometry in corals from Barbados: 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: Geochimica et Cosochimica Acta Quaternary Science Reviews Atmospheric radiocarbon calibration beyond 11, cal BP from Lake Suigetsu. Mass-spectrometric ThUU dating of the Devils Hole calcite vein. Pleistocene extinction of Genyornis newtoni: Uranium series dating of Quaternary deposits. Non-destructive gamma spectrometric U-series dating. A computer program for radiocarbon age calibration.
Last Ice Age millennial scale climate changes recorded in Huon Peninsula Corals. Continuous ,year climate record from vein calcite in Devils Hole, Nevada.