Accelerator mass spectrometry II: Background reduction with a Wien (velocity) filter; 10Be contents of Central American basalts
Our limit of detection for 10Be by accelerator mass spectrometry has been lowered to a few million atoms by the installation of a Wien filter which screens out co-transmitted 9Be. Analyses of six Central American basalts gave 10Be contents ranging from 1 × 10 6 to 60 × 10 6 atom/g. The sample richest in 10Be has been contaminated by sediments. The other samples have 10Be contents in the range reported in the literature by Brown and co-workers.