AMS measurements of 10Be and 26Al for studying shielding effects in meteorites

Abstract The 10 Be activites in 21 diogenites vary from 17 to 27 dpm/kg. These variations can primarily be ascribed to shielding effects, as was deduced from their correlation with the 22 Ne/ 21 Ne ratio. The 10 Be production rates in small diogenites are 10–30% higher than was predicted by a semi-empirical model based on the Knyahinya chondrite. This implies that 10 Be is less shielding dependent than expected. Our first AMS measurements of 26 Al in chondrites agree with earlier 26 Al γ-ray results.