Mathematics – Logic
Scientific paper
Sep 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995metic..30q.518h&link_type=abstract
Meteoritics, vol. 30, no. 5, page 518
Mathematics
Logic
Accelerator Mass Spectrometry, Cosmogenic Radionuclides, Exposure Ages, Meteorites, Saharan, Pairings
Scientific paper
The specific activities of the cosmogenic radionuclides 10Be and 26Al were determined by means of accelerator-mass-spectrometry and gamma-gamma-coincidence spectrometry, respectively, in a larger number of chondrites and rare meteorite types from the Sahara. Suggestions about possible pairings based on mineralogical and petrographical investigations were confirmed. The concentrations of ^10Be and ^26Al were found to be in saturation in the CR- and CH- chondrites which were investigated. So, production rates for ^10Be in CR- and CH-chondrites were measured to be 21 dpm/kg and 17 dpm/kg, respectively, and 26Al production rates of 45 dpm/kg for CR-chondrites and 30 dpm/kg for CH-chondrites were determined. Also, the ^26Al concentrations in 11 ordinary chondrites were found to be in saturation and allow the estimate of exposure ages of 3 x 10^6 years as lower limits for these meteorites. The results of nuclear track studies and the concentrations of ^10Be and ^26Al in a sample of Acfer 277 suggest, that the sample investigated was located not more than 8 cm below the original surface of a meteoroid of a radius between 25 cm and 65 cm and of an exposure age of 0.3 x 10^6 years. Acknowledgement: This work was supported by the Deutsche Forschungsgemeinschaft.
Dittrich-Hannen Beate
Herpers Ulrich
Kubik Peter W.
Meltzow B.
Romstedt Jens
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