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Science 26 March 1971:
Vol. 171. no. 3977, pp. 1240 - 1242
DOI: 10.1126/science.171.3977.1240
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Articles

Very Heavy Solar Cosmic Rays: Energy Spectrum and Implications for Lunar Erosion

R. L. Fleischer 1, H. R. Hart JR. 1, and G. M. Comstock 1

1 General Electric Research and Development Center, Schenectady, New York 12301

The energy spectrum of solar cosmic-ray particles of the iron group has been determined for the first time over the energy range from 1 to 100 million electron volts per nucleon by the use of glass removed from the Surveyor 3 spacecraft. The difference between the observed (energy)-3 spectrum and the limiting spectrum derived previously from tracks in lunar rocks gives an erosion rate of 0 to 2 angstroms per year. High-energy fission of lead, induced by galactic cosmicray protons and alpha particles, has also been observed.


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
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Electron Microscopy of Irradiation Effects in Space.
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Particle Track Etching: Diverse technological uses range from virus identification to uranium exploration.
R. L. Fleischer, R. L. Fleischer, H. W. Alter, S. C. Furman, P. B. Price, and R. M. Walker (1972)
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Ultrathin Amorphous Coatings on Lunar Dust Grains.
J. P. Bibring, J. P. Bibring, J. P. Duraud, L. Durrieu, C. Jouret, M. Maurette, and R. Meunier (1972)
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