uranium dating vs carbon dating

To see the fission tracks, the mineral surface is polished, etched with acids, and examined with an electron microscope. The radiation causes charge to remain within the grains in structurally unstable "electron traps". The Re-Os isotopic system was first developed in the early s, but recently has been improved for accurate age determinations. Archived from the original on 31 March Hanson; M. However, there is a limited range in Sm-Nd isotopes in many igneous rocks, although metamorphic rocks that contain the mineral garnet are useful as this mineral has a large range in Sm-Nd isotopes. The uranium-lead method includes the decay of U into Pb or Pb isotopes.

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