Solar flare neon composition and solar cosmic-ray exposure ages based on lunar mineral separates

Details Solar flare neon composition and solar cosmic-ray exposure ages based on lunar mineral separates Solar flare neon composition and solar cosmic-ray exposure ages based on lunar mineral separates

Feb 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...301..465n&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 301, Feb. 1, 1986, p. 465-470. Research supported by the Alexander von Humb

Astronomy and Astrophysics

Astrophysics

6

Abundance, Chronology, Lunar Composition, Neon, Solar Cosmic Rays, Solar Flares, Lunar Soil, Minerals, Pyroxenes, Radiation Dosage, Moon, Solar Flares, Neon, Composition, Cosmic Rays, Exposure Age, Soil, Minerals, Samples, Lunar, Pyroxene, 14148, 24087, Feldspar, 61221, Apollo Missions, Isotopes, Elements, Techniques, Isotopic Ratios, Flux, 69921, Production Rates, Dating Methods, Comparisons, Experiments

Scientific paper

Etched pyroxene grain-size separates from lunar soils 14148 and 24087 and etched feldspar grain-size separates from soil 61221 are analyzed for neon isotopic and elemental composition, and the procedures to isolate the implanted solar flare (SF) neon and solar and Galactic cosmic-ray (SCR and GCR)-produced Ne components in these samples are discussed. These results indicate that the SF neon composition is Ne-20/Ne-22 = 11.6 + or - 0.2. The surface exposure ages are determined from the resolved SCR-produced Ne contents in the mineral separates from soils 14148, 24087, and 69921 using the appropriate SCR-Ne-21 production rates for feldspars and pyroxenes, based on the SCR proton flux of J (equal to or greater than 10 MeV) = 100 protons/sq cm per sec and R(0) = 100 MV. These SCR ages agree with those determined by particle track methods within a factor of 2.

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