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The moon

, Volume 8, Issue 3, pp 253–286 | Cite as

Cosmic ray effects induced in a rock exposed on the moon or in free space: contrast in patterns for ‘tracks’ and ‘isotopes’

  • S. K. Bhattacharya
  • J. N. Goswami
  • S. K. Gupta
  • D. Lal
Article

Abstract

Analytical studies are reported here for two cosmogenic effects due to low energy particles in extraterrestrial samples:
  1. (i)

    Formation of latent chemically etchable tracks in crystalline materials due to solid state damage as a result of ionisation losses suffered by multicharged cosmic ray nuclei, and

     
  2. (ii)

    Production of low threshold isotopes due to nuclear interactions of solar cosmic ray particles.

     

The present analytical treatment is different from those previously reported and is more directly applicable to recent studies of low energy cosmogenic effects in meteorites and in lunar samples. We consider irradiation of ellipsoidal rocks in space and on the Moon. In the latter case, different irradiation geometries corresponding to different burials in the regolith are also considered.

It is shown that results of irradiation of an object on the surface of a parent body differ from that of an object in free space in more complex manner than a uniform reduction by a factor of two due to the change over from 2π to 4π irradiation. Isocontours for ‘tracks’ or ‘isotopes’ are found to be markedly different in the two cases. Thus, the irradiation geometry must be explicitly taken into account in interpreting low-energy cosmogenic effects in lunar rocks. Simultaneous analyses of tracks and radioisotopes of different half-lives should allow one to establish principal irradiation geometries both for meteorites and lunar samples.

Keywords

Burial State Damage Ionisation Loss Parent Body Lunar Sample 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© D. Reidel Publishing Company 1973

Authors and Affiliations

  • S. K. Bhattacharya
    • 1
    • 2
  • J. N. Goswami
    • 1
    • 2
  • S. K. Gupta
    • 1
    • 2
  • D. Lal
    • 1
    • 2
  1. 1.Tata Institute of Fundamental ResearchBombayIndia
  2. 2.Physical Research LaboratoryAhmedabadIndia

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