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The New Zealand physicist Ernest Rutherford, suggested in 1905 that the exact age of a rock could be measured by means of radioactivity.
For the first time he was able to exactly measure the age of a uranium mineral.
If the rock containing these minerals is heated, the tracks will begin to disappear.
If the rock is heated high enough, 120C for apatite, all tracks will disappear.
U-Pb ages of zircon in sediments are used to determine the provenance of the sediments. Fission-track analysis is useful in determining the thermal history of a sample or region.When Rutherford announced his findings it soon became clear that Earth is millions of years old.These scientists and many more after them discovered that atoms of uranium, radium and several other radioactive materials are unstable and disintegrate spontaneously and consistently forming atoms of different elements and emitting radiation, a form of energy in the process.Quaternary geology provides a record of climate change and geologically recent changes in environment.U-Pb geochronology of is used for determining the age of emplacement of igneous rocks of all compositions, ranging in age from Tertiary to Early Archean.