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Problems Related to Interplanetary Matter (1961) / Chapter Skim
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COSMIC RAY AGES OF IRON METEORITES
Pages 22-27

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From page 22...
... To measure the cosmic ray exposure age one needs to measure the time-integrated content and rate of production of a cosmic ray produced nuclide which was not present in the meteorite before being exposed to cosmic rays. The most easily measured products are the stable rare gases.
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From page 23...
... In comparing the results of thin target irradiations to the products in meteorites one must exercise some caution. In the meteorite, a large number of low energy secondaries are formed which in turn produce radioactive and stable rare gas products.
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From page 24...
... For this reason a cosmic ray age calculated from a T/He3 ratio depends on the depth in the original meteorite. In additon to determining cosmic ray exposure ages a study of cosmic ray produced activities can also lead to new knowledge about the cosmic rays themselves.
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From page 25...
... required for a measurement of the low level activities. It would be possible to use the rare gases alone if one had some way to make a correction for the change in cosmic ray flux with depth inside a meteorite.
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From page 26...
... 200 400 600 800 1000 1200 I4OO 1600 1800 AGE IN my e 1. Cosmic ray exposure ages of iron meteorites 26
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From page 27...
... It appears that this upper limit is significantly lower than the dust concentration in the region of the inner planets estimated from the intensity of the zodiacal light. Anders: In this connection, it is important to remember that a critical parameter is the orbital inclination.
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Key Terms

  • rare gas
  • exposure ages
  • ray exposure
  • cosmic rays
  • ray age

  • ray flux
  • exposure age
  • iron meteorites
  • ray produced
  • stable rare

  • rare gases
  • production rate
  • ray production
  • ray ages
  • gas ratios

  • relative production
  • age dependent
  • production ratios
  • production rates
  • lived isotope

  • original meteorite
  • half life
  • radioactive nuclide
  • determine cosmic
  • determining cosmic

  • ray particles
  • ray induced
  • compute exposure
  • easily measured
  • energy dependence


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