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

Published online by Cambridge University Press:  18 July 2016

L Wacker ,
M Grajcar ,
S Ivy-Ochs ,
PW Kubik  and
M Suter
L Wacker*
Affiliation:
Institute for Particle Physics, ETH Hönggerberg, CH-8093 Zürich, Switzerland.
M Grajcar
Affiliation:
Institute for Particle Physics, ETH Hönggerberg, CH-8093 Zürich, Switzerland.
S Ivy-Ochs
Affiliation:
Institute for Particle Physics, ETH Hönggerberg, CH-8093 Zürich, Switzerland.
PW Kubik
Affiliation:
Paul Scherrer Institut (PSI), c/o Institute for Particle Physics, ETH Hönggerberg, CH-8093 Zürich, Switzerland.
M Suter
Affiliation:
Institute for Particle Physics, ETH Hönggerberg, CH-8093 Zürich, Switzerland.
*
Corresponding author. Email: wacker@phys.ethz.ch.
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Abstract

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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.

Type
Articles
Information
Radiocarbon , Volume 46 , Issue 1: Proceedings of the 18th International Radiocarbon Conference (Part 1 of 2), Conference Editors: Nancy Beavan Athfield, Rodger J Sparks , 2004 , pp. 83 - 88
Copyright
Copyright © 2004 by the Arizona Board of Regents on behalf of the University of Arizona 

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