Nuclear tracks in the Angra DOS Reis and Moore County meteorites

Details Nuclear tracks in the Angra DOS Reis and Moore County meteorites Nuclear tracks in the Angra DOS Reis and Moore County meteorites

Aug 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976gecoa..40..935c&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 40, Aug. 1976, p. 935-944.

Physics

1

Achondrites, Cosmic Rays, Fission Products, Helium Isotopes, Particle Tracks, Abundance, Alpha Particles, Annealing, Heavy Elements, Plutonium 244, Uranium 238

Scientific paper

The paper presents results on studies of charged particle tracks in the Angra dos Reis and Moore County meteorites, both with an unexplained excess of He-4, with a selective annealing method used to separate cosmic ray tracks from fission tracks. The following cosmic ray and fission track densities, respectively, were obtained (in units of 10 to the 6th per sq cm): Angra dos Reis: 1.3-4.4 and 7.8; Moore County feldspar: 1.9-3.0 and 0.51; Moore County pigeonite: 2.0-2.9 and 0.078-0.35. The Pu-244/U-238 ratios at the start of track retention were 0.003 for Angra dos Reis and 0.002-0.03 for Moore County. No evidence was found for fission tracks attributable to the unknown progenitor of excess He-4 and a search for pleochroic halos also proved negative.

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