New interpretation of the e10Be and l26Al content in cosmic spherules

Details New interpretation of the e10Be and l26Al content in cosmic spherules New interpretation of the e10Be and l26Al content in cosmic spherules

Mar 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997nimpb.123..319z&link_type=abstract

Nuclear Instruments and Methods in Physics Research Section B, v. 123, p. 319-323.

Physics

Scientific paper

The observed concentrations of cosmogenic nuclides in extraterrestrial matter are usually interpreted in terms of the exposure history of the irradiated specimen or in terms of the history of the cosmic radiation itself. For small meteorites in the microgram mass range we present a theoretical approach which allows a new interpretation of the measured concentrations. In particular, we show how to determine the size distribution of the interplanetary dust and how to investigate the related phenomena (radiation pressure, mutual collisions, atmospheric entry). For this, the concentrations of the radioisotopes e10Be and l26Al contained in spherules from deep sea sediments were measured by means of the AMS technique. Due to the small sample size, the carrier amount was successfully kept very low: around 50 μg for Be and between 100 and 200 μg for Al.

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