Comparison of 41Ca analysis on 0.5 MV and 5 MV-AMS systems

Schulze-Konig, T., Maden, C., Denk, E., Freeman, S. , Stocker, M., Suter, M., Synal, H.A. and Walczyk, T. (2010) Comparison of 41Ca analysis on 0.5 MV and 5 MV-AMS systems. Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 268, pp. 752-755. (doi:10.1016/j.nimb.2009.10.022)

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Publisher's URL: http://www.elsevier.com/locate/nimb

Abstract

A comparative study was made between the compact AMS system at the PSI/ETH Laboratory of Ion Beam Physics in Zurich with 0.5 MV terminal voltage and the 5 MV-AMS system at the Scottish Universities Environmental Research Centre (SUERC), Glasgow. Overall 34 urinary samples with 41Ca/40Ca ratios in the range from 4x10-11 to 3x10-10 were processed to CaF2 and aliquots of the same material were measured on both instruments. Measurements on the compact AMS system were performed in charge state 3+ achieving a transmission of 4% at 1.7 MeV beam energy. Under these conditions a suppression of the interference 41K is virtually impossible. However, samples with an excess of potassium can be identified by a shift of the 41Ca/41K peak in the DE E histogram of the gas ionization detector employed and a criterion for data rejection can be defined. An overall precision of 4% and a 41Ca/40Ca background level of 5 1012 have been reached. For studies with higher demands on the detection limit AMS systems like the one at SUERC are attractive: in charge state 5+ and using a gas stripper beam energy of 27 MeV, a transmission of 5%, a 41K suppression factor of 500 and a 41Ca/40Ca background level of 3x10-14 are achieved. We demonstrate that both systems are well suited for large-scale 41Ca biomedical applications.

Item Type:Articles
Keywords:compact AMS; biomedical AMS; 41Ca; Ca41; Accelerator Mass Spectrometry
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Freeman, Professor Stewart
Authors: Schulze-Konig, T., Maden, C., Denk, E., Freeman, S., Stocker, M., Suter, M., Synal, H.A., and Walczyk, T.
Subjects:G Geography. Anthropology. Recreation > GE Environmental Sciences
College/School:College of Science and Engineering > Scottish Universities Environmental Research Centre
Journal Name:Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms
Publisher:Elsevier
ISSN:0168-583X
Published Online:08 October 2010

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