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This review will be limited to some aspects of the Ra system with half-lives of 245 kyr, 76 kyr and 1.6 kyr, respectively.

In environmental systems, fractionation of uranium and thorium is a very efficient process because thorium is extremely insoluble while hexavalent uranium in oxidising conditions is relatively soluble.

The contributions of uranium/thorium and marine palynology to the dating of the Lake Wangoom pollen record, western plains of Victoria, Australia.

230Th/234U and 14C dating of a late Pleistocene stalagmite in Lobatse II cave, Botswana.

Pleistocene extinction of Genyornis newtoni: human impact on Australian megafauna.

Non-destructive gamma spectrometric U-series dating.

We use U-Th dating to obtain a chronology for stalagmites which are used for palaeoclimate research (pdf), dating carbonate crusts on cave art to derive minimum age constraints for underlying art(paper Hoffmann et al. (2012) (DOI: 10.1126/science.1219957), speleothem formations in stratigraphic relationship with archaeological artefacts, travertine formation in relation with archaeology.U at the time of sample formation must be known or calculated. With time, Thorium 230 accumulates in the sample through radiometric decay. Uranium series dating of impure carbonates: an isochron technic using total sample dissolution. A large drop in atmospheric 14C/12C and reduced melting in the Younger Dryas, documented with 230Th ages of corals.

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