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Fission track dating is a radiometric dating technique that can be used to determine the age of crystalline materials that contain uranium. As uranium decays, it sends out atomic fragments, which leave scars or "fission tracks" in crystalline structures. Because decaying uranium emits fragments at a constant rate, the number of fission tracks correlates to the age of the object1. This method is generally held to be accurate, as it shows a high degree of concordance with other methods such as potassium-argon dating2.(3)
Dates of over 100,000 years have been retrieved with this method.