Cosmogenic Be-10 and Al-26 in metal, carbon, and silicate of meteorites

Details Cosmogenic Be-10 and Al-26 in metal, carbon, and silicate of meteorites Cosmogenic Be-10 and Al-26 in metal, carbon, and silicate of meteorites

Aug 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993gecoa..57.3705n&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 57, no. 15, p. 3705-3723.

Computer Science

17

Chemical Composition, Cosmic Rays, Cosmochemistry, Meteoritic Composition, Nuclides, Phase Separation (Materials), Radiation Chemistry, Radiation Shielding, Reaction Products

Scientific paper

Cosmogenic nuclides Be-10 and Al-26 were determined in various meteorites, including chondrites, stony irons, and irons. In an effort to obtain information concerning shielding conditions for cosmic ray irradiation in meteorites, these two nuclides were measured in separated metal phases, where they are high-energy products, and in separated stone phases, where they are lower-energy products. Graphite phases, representing the single smallest mass target, were also separated from the IA group irons, and a high production rate of Be-10 was determined in carbon. As an example of a large chondrite, Tsarev (L5) was examined by measuring several fragments recovered from different depths. Using measurements of fragments of the Jilin chondrite, the shielding indexes were formulated as a function of depth during its first-stage 2pi irradiation. Based on the data obtained in this work and the literature cited, shielding in meteorites, in general, is expressed quantitatively by two universal parameters, as follows: k-prime(2), a measure of the irradiation hardness or the spectral shape of the flux; and k-prime(1), a measure of the intensity of the irradiation. For chondrites, these parameters have been related numerically to the size of the preatmospheric body and the sample depth in it.

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