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Both of these dating methods assume that the proportion of Th to Th is a constant during the period when the sediment layer was formed, that the sediment did not already contain thorium before contributions from the decay of uranium, and that the thorium cannot migrate within the sediment layer. Sharp stone tools allowed hominins to cut wood more easily or strip meat from bones. In these materials, 40 K decays into 40 Ar a gas , which is trapped within the mineral crystals as the materials cool. Journal of Radioanalytical and Nuclear Chemistry. Posted January 19, Uranium-thorium dating in corals is an example where exchange with seawater is an issue. I'm no expert, but I know a little about radiometric dating and how it works.

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