"fission track." YourDictionary, n.d. Web. 11 November 2018. <https://www.yourdictionary.com/fission-track>.
fission track. (n.d.). Retrieved November 11th, 2018, from https://www.yourdictionary.com/fission-track
A track left by the decay of uranium atoms in a mineral. By analyzing the number and nature of these tracks in a sample mineral and inducing further fission of the remaining uranium by irradiation with neutrons to create new tracks for comparison, one can estimate the approximate age of the sample.