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    • Fission tracks in the mineral apatite, viewed under a microscope
    Rights: Geotrack International Pty Limited, Melbourne. Published 11 May 2011, Updated 1 February 2022 Size: 260 KB Referencing Hub media

    Fission tracks in the mineral apatite, viewed through a microscope. The surface of the apatite crystal has been polished and etched to help show up the fission tracks. Fission tracks in zircon from volcanic ash look similar.

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      Fission track and luminescence dating

      Most absolute dates for rocks are obtained by radiometric methods methods, which are based on the radioactive decay of certain chemical elements. Most radiometric methods directly measure the ...

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