论文信息 - 10Be Analyses with a Compact AMS Facility—Are Bef2 Samples the Solution?

10Be Analyses with a Compact AMS Facility—Are Bef2 Samples the Solution?

The injection of 10BeF- instead of 10BeO- into a compact accelerator mass spectrometry system with a terminal voltage of 0.58 MV was investigated, because BF- molecules are unstable and isobaric interference of 10B with 10Be can thus be significantly reduced. We describe the method we developed to prepare BeF2 samples. 10Be was measured in a segmented gas ionization detector. Separation of 10Be from 10B could be achieved both for ions in the 1+ charge state with an energy of 0.8 MeV and in the 2+ charge state with an energy of 1.4 MeV. The 2+ ions are better separated, whereas the 1+ charge state has a higher transmission. 10Be/9Be ratios (~10-12) in a suite of rock samples were successfully determined for exposure dating in either charge state and compared with measurements made on the 6MV tandem.

M. Suter | L. Wacker | S. Ivy‐Ochs | P. Kubik | M. Grajcar

[1] M. Döbeli,et al. 10Be measurements with terminal voltages below 1 MV , 2004 .

[2] M. Döbeli,et al. Status of the PSI/ETH compact AMS facility , 2004 .

[3] M. Döbeli,et al. Gas ionization chambers with silicon nitride windows for the detection and identification of low energy ions , 2004 .

[4] L. Cederbaum,et al. Short- and long-lived electronic states of BF− , 2002 .

[5] H. Synal,et al. The PSI/ETH small radiocarbon dating system , 2000 .

[6] M. Döbeli,et al. Status report of the PSI/ETH AMS facility , 1997 .

[7] S. Ivy‐Ochs,et al. The chemical behavior of Be, Al, Fe, Ca and Mg during AMS target preparation from terrestrial silicates modeled with chemical speciation calculations , 1997 .