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A Simple Way to Upgrade a Compact Radiocarbon AMS Facility for 10Be

Published online by Cambridge University Press:  09 February 2016

Arnold Milenko Müller*
Affiliation:
Laboratory of Ion Beam Physics, ETH Zurich, 8093 Zurich, Switzerland
Martin Suter
Affiliation:
Laboratory of Ion Beam Physics, ETH Zurich, 8093 Zurich, Switzerland
Dongpo Fu
Affiliation:
State Key Laboratory of Nuclear Physics and Technology and Institute of Heavy Ion Physics, Peking University, Beijing 100871, China
Xingfang Ding
Affiliation:
State Key Laboratory of Nuclear Physics and Technology and Institute of Heavy Ion Physics, Peking University, Beijing 100871, China
Kexin Liu
Affiliation:
State Key Laboratory of Nuclear Physics and Technology and Institute of Heavy Ion Physics, Peking University, Beijing 100871, China
Hans-Arno Synal
Affiliation:
Laboratory of Ion Beam Physics, ETH Zurich, 8093 Zurich, Switzerland
Liping Zhou
Affiliation:
Department of Geography, Peking University, Beijing 100871, China
*
2Corresponding author. email: arnold.mueller@phys.ethz.ch.

Abstract

A simple way to upgrade the Peking University 500kV NEC radiocarbon facility (CAMS) for 10Be measurements is presented. In a first phase, a silicon nitride foil as passive boron degrader was mounted in front of the electrostatic deflector near the focal plane of 10Be. The Si detector at the end of the beam line was replaced with a high-resolution ΔE-Eres gas ionization chamber. In addition, a Faraday cup for the measurement of 9Be1+ was installed. Tests with this arrangement showed promising results: a 10Be/9Be background level of 3.4 × 10–14 and an overall transmission for 10Be of 2.2% were obtained. Measurements of standards showed very good stability and reproducibility. In the next step, it is planned to add a second magnet to reduce the background and to partly compensate losses due to energy and angular straggling in the degrader foil by the energy and angular refocusing effect of a magnetic sector field. With this final arrangement, a performance with 10Be/9Be background levels at 10−15 and 10Be overall transmission of 6–7% can be expected. The design proposed in this paper has the advantage that the modifications can be realized in a rather inexpensive way and that the measurement performance for 14C will not be affected.

Type
Articles
Copyright
Copyright © 2013 by the Arizona Board of Regents on behalf of the University of Arizona 

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