Fission-track dating

Physics

Scientific paper

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Mineralogy, Nuclear Fission, Particle Tracks, Radioactive Age Determination, Spontaneous Emission, Uranium 238, Cosmology, Heavy Elements, Optical Microscopes, Radioactive Isotopes, Zirconium

Scientific paper

Fission-track dating is based on the measurement of the spontaneous fission of certain heavy elements, in particular the fission of the most abundant isotope of uranium, U-238. It is possible to determine the absolute age of an appropriate sample for analysis over an enormous span of time from as recently as a few decades ago to as far back as the time when the solar system was formed. The nearly invisible original tracks produced by the fission events can be enlarged a 100 or more times by subjecting the sample to the action of a suitable solvent. This enlargement makes it possible to observe the tracks under the light microscope at magnifications of 500 to 1000 diameter. The basic method of dating by fission-track analysis is to count the number of tracks per unit area of the sample.

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