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Fission track dating is a radiometric dating technique based on analyses of the damage trails, or else tracks, left by fission fragments in certain uranium -bearing minerals and glasses. The method argues using the number of fission events produced from the unwitting decay of uranium in park accessory minerals to date the time of rock cooling beneath closure temperature.
Fission tracks are sensitive to heat, and as a result the technique is useful by the side of unraveling the thermal evolution of rocks and minerals. Most in touch research using fission tracks is aimed at: Unlike other isotopic dating methods, the " spawn " in fission track dating is an effect in the crystal rather than a son isotope. Uranium undergoes spontaneous fission decay at a known take to task, and it is the just isotope with a decay assess that is relevant to the significant production of natural fission tracks; other isotopes have fission decay rates too slow headed for be of consequence.
The fragments emitted by this fission leave trails of damage relic tracks or ion tracks hip the crystal structure of the mineral that contains the uranium. The process of track opus is essentially the same beside which swift heavy ions give off ion tracks.
Chemical etching of polished internal surfaces of these minerals reveals spontaneous fission tracks, and the track density container be determined. Because etched tracks are relatively large in the range 1 to 15 micrometres , counting can be done in by optical microscopy , even if other imaging techniques are tolerant of. The density of fossil tracks correlates with the cooling time eon of the sample and together with uranium content, which needs near be determined independently.
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