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Problems Related to Interplanetary Matter (1961) / Chapter Skim
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COSMIC RAY PRODUCTION OF RADIOACTIVE NUCLIDES IN IRON METEORITES
Pages 45-50

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From page 45...
... produced by cosmic rays in iron meteorites. A number of short-lived species are also currently being measured in the recently fallen iron meteorite Aroos.
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From page 46...
... Our chemical procedures have been distinguished by the use of unusually large samples in order to permit comparatively accurate measurements, and by a serious and apparently successful effort to recycle to constant specific activity in each case. We have also been able because of the level of activity observed to apply certain auxiliary tests such as the measurement of beta absorption curves.
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From page 47...
... This method is satisfactory in making comparisons of production rates of isotopes which have no important production below 300 Mev. However, no plausible set of cross sections can be found in this model to account for the production of so much Mn53 or other species close to the target nucleus as is actually observed.
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From page 48...
... Admittedly they should be checked with iron blocks of various dimensions, but they do seem consistent with the fact that one keeps finding small meteorites which all show about the same radioactivity level. Many studies have been made of star size distributions in emulsions in the free atmosphere at various depths.
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From page 49...
... Presumably it is capable of being made exact as energy distributions and excitation functions are improved. Preliminary calculations for the production rates of radioactive and stable isotopes are in gratifying agreement with experiment.
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From page 50...
... Space Sci.
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Key Terms

  • production rates
  • iron meteorites
  • production rate
  • star size
  • energy spectrum

  • energy distribution
  • ray flux
  • iron meteorite
  • iron bar
  • primary energy

  • ray ages
  • ray intensity
  • preliminary calculations
  • steady state
  • free atmosphere

  • radioactive nuclides
  • cross section
  • size distribution
  • activity ratios
  • cross sections

  • canyon diablo
  • various nuclides
  • engineering university
  • excitation functions
  • recently fallen

  • following table
  • comparatively accurate
  • significant compared
  • size distributions
  • secondary energy


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