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fission track

  1. 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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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.