Dec 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976sciam.235..114m&link_type=abstract
Scientific American, vol. 235, Dec. 1976, p. 114-122.
Physics
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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