Computer Science
Scientific paper
Aug 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980natur.286..788r&link_type=abstract
Nature, vol. 286, Aug. 21, 1980, p. 788-790.
Computer Science
4
Galactic Radiation, Helium Isotopes, Lunar Rocks, Radiation Dosage, Solar Cosmic Rays, Solar Flares, Solar Protons, Chronology, Proton Flux Density, Spallation, Moon, Helium, Solar Flares, Samples, Lunar, Rocks, Soils, Isotopes, Cosmic Rays, Composition, Spallation, Spectrum, Rare Gases, Energy, Irradiation, Flux, Depth, Protons, Comparisons, Exposure Ages, Data, Procedure, Neon, Argon, Dating Techniques, Ages, Diffusion, Outgassing
Scientific paper
The use of He-3 as an indicator of lunar sample exposure history in the investigation of absolute solar cosmic ray (flare) proton fluxes in the past few million years is discussed. A means for deducing the solar cosmic ray proton flux from the measured spallogenic He-3 contents of lunar rocks with simple histories of exposure to solar and the more energetic galactic cosmic rays is presented and used to obtain the solar cosmic ray exposures of six samples from known depths of the well-documented lunar rocks 61016 and 64435. Results are found to be in agreement with exposure ages determined from Ne-21 and Ar-38 determinations, which indicate a solar proton flux at energies greater than 10 MeV of 70/sq cm per sec.
Rao Mallikharjuna N.
Venkatesan T. R.
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