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This technique is, however, useful for providing relative dates for objects found at the same site.

It is possible to calculate the age of a sample by measuring the uranium content and the density of the fission tracks.This form of uranium usually decays into a stable lead isotope but the uranium atoms can also split – a process known as fission.During this process the pieces of the atom move apart at high speed, causing damage to the rock or mineral.Sedimentary rocks are rarely useful for dating because they are made up of bits of older rocks.Uranium is present in many different rocks and minerals, usually in the form of uranium-238.Different methods have their own limitations, especially with regard to the age range they can measure and the substances they can date.