Fission-track meaning

A track of damage to the crystal structure of a mineral, caused by the decay of uranium atoms and used to estimate the mineral's age.
noun
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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.
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