Boron concentrations in carbonaceous chondrites

Computer Science

Scientific paper

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Abundance, Boron, Carbonaceous Chondrites, Meteoritic Composition, Activation Analysis, Orgueil Meteorite, Photosphere, Solar System, Carbonaceous Chondrites, Concentrations, Abundance, Boron, Element Ratios, Samples, Meteorites, Solar System, Atmosphere, Cosmic Ray Tracks, Allende Meteorite, Muchison Meteorite, Orgueil Chondrite, Murray Meteorite, Lance Meteorite, Ivuna Meteorite

Scientific paper

The boron abundance in carbonaceous chondrites is analyzed in an attempt to explain the large discrepancy between solar-system boron abundances derived from meteorites and from the solar photosphere. The boron concentrations in carefully prepared samples from six carbonaceous chondrites were determined using the nuclear reactions B-11(d, p)B-12 and B-10(n, alpha)Li-7. The experimental procedures employed are described in minute detail, with special attention given to B-12 activation analysis, background reactions, required corrections, estimated errors, particle track B analysis, sample preparation, contamination effects, and some general aspects of instrumental boron analysis. The results obtained are compared with those of previous studies, and a solar-system B/Si ratio of 0.000045 is proposed. The possibility of a boron overabundance in carbonaceous chondrites is considered, the actual distribution of boron in the studied meteorites is examined, and the origin of the Al-26 present in Allende inclusions is investigated.

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