Radioactivities in returned lunar materials and in meteorites

Details Radioactivities in returned lunar materials and in meteorites Radioactivities in returned lunar materials and in meteorites

Sep 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983sao..rept.....f&link_type=abstract

Final Report, 1 Feb. 1971 - 31 May 1983 Smithsonian Astrophysical Observatory, Cambridge, MA.

Astronomy and Astrophysics

Astrophysics

Carbon 14, Half Life, Lunar Soil, Meteorites, Radioactivity, Tritium, Argon Isotopes, Cosmic Rays, Lunar Rocks, Solar Flares, Solar Wind

Scientific paper

The cosmic-ray, solar-flare, and solar-wind bombardments of lunar rocks and soils and meteorites were studied by measurements of tritium, carbon-14 and argon radioactivity. The radioactivity integrates the bombardment for a time period equal to several half-lines. H-3, Ar-37, Ar-39, C-14. For the interior samples of lunar rocks and for deep lunar soil samples, the amounts of the radioactivities were equal to those calculated for galactic cosmic-ray interactions. The top near-surface samples of lunar rocks and the shallow lunar soil samples show excess amounts of the radioactivities attributable to solar flares. Lunar soil fines contain a large amount of hydrogen due to implanted solar wind. Studies of the H-3 in lunar soils and in recovered Surveyor-3 materials gave an upper limit for the H-3/H ratio in the solar wind of 10 to the -11th power. Solar wind carbon is also implanted on lunar soil fines. Lunar soils collected on the surface contained a 0.14 component attributable to implanted solar wind C-14. The C-14/H ratio attributed to the solar wind from this C-14 excess is approximately 4 x 10 to the -11th power.

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