Operation of the Small BioAMS spectrometers at CAMS: Past and future prospects

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS

卷:361

Article; Proceedings Paper

Ognibene, T. J.¹  Haack, K. W.¹  Bench, G.¹  Brown, T. A.¹  Turteltaub, K. W.² 

[1] Lawrence Livermore Natl Lab, Ctr Accelerator Mass Spectrometry, Livermore, CA 94551 USA

[2] Lawrence Livermore Natl Lab, Biol & Biotechnol Div, Livermore, CA 94551 USA

关键词: Accelerator mass spectrometry;    SSAMS;    Graphite;    Biomedical AMS;    C-14;   

DOI  :  10.1016/j.nimb.2015.05.019

来源: Elsevier

【 摘 要 】

A summary of results from the solid samples run on our compact 1 MV AMS system over its 13.5 years of operation is presented. On average 7065 samples per year were measured with that average dropping to 3278 samples per year following the deployment of our liquid sample capability. Although the dynamic range of our spectrometer is 4.5 orders in magnitude, most of the measured graphitic samples had C-14/C concentrations between 0.1 and 1 modern. The measurements of our ANU sucrose standard followed a Gaussian distribution with an average of 1.5082 +/- 0.0134 modern. The LLNL biomedical AMS program supported many different types of experiments, however, the large majority of samples measured were derived from animal model systems. We have transitioned all of our biomedical AMS measurements to the recently installed 250 kV SSAMS instrument with good agreement compared in measured C-14/C isotopic ratios between sample splits. Finally, we present results from replacement of argon stripping gas with helium in the SSAMS with a 22% improvement in ion transmission through the accelerator and high-energy analyzing magnet. (C) 2015 Elsevier B.V. All rights reserved.

【 授权许可】

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