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Article

Semi-Automated Equipment for CO2 Purification and Graphitization at the A.E. Lalonde AMS Laboratory (Ottawa, Canada)

  • Gilles St-Jean (a1), William E Kieser (a2), Carley A Crann (a1) and Sarah Murseli (a1)
Abstract

New computer-controlled, semi-automatic systems were designed and built for CO2 purification and graphitization at the A.E. Lalonde Accelerator Mass Spectrometry (AMS) Laboratory with consideration for user friendliness and high throughput. The stainless steel vacuum lines are orbitally welded to ensure clean seams with low memory. The insulated graphitization ovens with plug-in electrodes provide a hazard-free environment for operators. The closed-loop cooling system circulating low-viscosity Dynalene at –40°C provides highly efficient water trapping. The LabVIEWTM software features (1) pressure and temperature recording for QA/QC; (2) safety interlocks to preclude operator errors resulting in sample loss, cross-contamination, or damaging a vacuum pump; and (3) automation for leak checking, iron conditioning, and running samples. Results from the first year of routinely measured standards, reference, and background materials are reproducible and within acceptance values. In the first year of operation (commissioned in spring 2014), over 1000 targets (~60% unknowns) were produced. With new tube sealing and CO2 purification lines, and two more graphitization lines now operational, the Lalonde AMS Laboratory is able to provide routine radiocarbon analysis (>200 µg carbon) at a capacity of more than 7000 targets per year. Most importantly, the equipment is safe and intuitive, making it ideal for education and training students to run their own samples.

Copyright
© 2016 by the Arizona Board of Regents on behalf of the University of Arizona 
Corresponding author
*Corresponding author. Email: radiocarbon@uottawa.ca.
Footnotes
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Selected Papers from the 2015 Radiocarbon Conference, Dakar, Senegal, 16–20 November 2015

Footnotes
References
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Aerts-Bijma, AT, Meijer, HAJ, van der Plicht, J. 1997. AMS sample handling in Groningen. Nuclear Instruments and Methods in Physical Research B 123(1–4):221–225.
Aerts-Bijma, AT, van der Plicht, J, Meijer, HAJ. 2001. Automatic AMS sample combustion and CO2 collection. Radiocarbon 43(2):293–298.
Arnold, M, Bard, E, Maurice, P, Duplessy, J-C. 1987. 14C dating with the Gif-sur-Yvette Tandetron accelerator: status report. Nuclear Instruments and Methods in Physical Research B 29(1–2):120–123.
Crann, CA, Murseli, S, St-Jean, G, Zhao, X-L, Kieser, WE. 2016. First status report on radiocarbon sample preparation techniques at the A.E. Lalonde AMS Laboratory (Ottawa, Canada). Radiocarbon, this issue. DOI:10.1017/RDC.2016.55.
Hut, G, Göte Östlund, H, van der Borg, K. 1986. Fast and complete CO2-to-graphite conversion for 14C accelerator mass spectrometry. Radiocarbon 28(2A):186–190.
Jensen, BJL, Reyes, AV, Froese, DG, Stone, DB. 2013. The Palisades is a key reference site for the middle Pleistocene of eastern Beringia: new evidence from paleomagnetics and regional tephrostratigraphy. Quaternary Science Reviews 63:91–108.
Kato, K, Tokanai, F, Anshita, M, Sakurai, H, Ohashi, MS. 2014. Automated sample combustion and CO2 collection system with IRMS for 14C AMS in Yamagata University, Japan. Radiocarbon 56(1):327–331.
Kieser, WE, Zhao, X-L, Clark, ID, Cornett, RJ, Litherland, AE, Klein, M, Mous, DJW, Alary, J-F. 2015. The André E. Lalonde AMS Laboratory – the new accelerator mass spectrometry facility at the University of Ottawa. Nuclear Instruments and Methods in Physics Research B 361:110–114.
Kitagawa, H, Masuzawa, T, Nakamura, T, Matsumoto, E. 1993. A batch preparation method for graphite targets with low background for AMS 14C measurement. Radiocarbon 35(2):295–300.
Kretschmer, W, Anton, G, Bergmann, M, Finckh, E, Kowalzik, B, Klein, M, Leigart, M, Merz, S, Morgenroth, G, Piringer, I. 1997. The Erlangen AMS facility: status report and research program. Nuclear Instruments and Methods in Physics Research B 123(1–4):93–96.
Law, IA, Hedges, REM. 1990. A semi-automated bone pretreatment system and the pretreatment of older and contaminated samples. Radiocarbon 31(3):247–253.
McNichol, AP, Gagnon, AR, Jones, GA, Osborne, EA. 1992. Illumination of a black box: analysis of gas composition during graphite target preparation. Radiocarbon 34(3):321–329.
Němec, M, Wacker, L, Gäggeler, H. 2010. Optimization of the automated graphitization system AGE-1. Radiocarbon 52(2–3):1380–1393.
Pearson, A, McNichol, AP, Schneider, RJ, von Reden, KF, Zheng, Y. 1998. Microscale AMS 14C measurement at NOSAMS. Radiocarbon 40(1):61–75.
Reyes, AV, Froese, DG, Jensen, BJL. 2010. Permafrost response to last interglacial warming: field evidence from non-glaciated Yukon and Alaska. Quaternary Science Reviews 29(23–24):3256–3274.
Rozanski, K. 1991. Consultants’ group meeting on 14C reference materials for radiocarbon laboratories. February 18–20, 1991, Vienna, Austria. Internal Report, IAEA, Vienna.
Rozanski, K, Stichler, W, Gonfiantini, R, Scott, EM, Beukens, RP, Kromer, B, van der Plicht, J. 1990. The IAEA 14C intercomparison exercise 1990. Radiocarbon 34(3):506–519.
Santos, GM, Mazon, M, Southon, JR, Rifai, S, Moore, R. 2007. Evaluation of iron and cobalt powders as catalysts for 14C-AMS target preparation. Nuclear Instruments and Methods in Physical Research B 259(1):308–315.
Sie, SH, Leaney, F, Gillespie, R, Suter, GF, Ryan, CG. 1994. Radiocarbon measurements at the CSIRO AMS facility. Nuclear Instruments and Methods in Physics Research B 92(1–4):35–38.
Southon, J. 2007. Graphite reactor memory – Where is it from and how to minimize it? Nuclear Instruments and Methods in Physical Research B 259(1):288–292.
Turnbull, J, Prior, C. 2010. Report on the 20th International Radiocarbon Conference graphitization workshop. Radiocarbon 52(2–3):1230–1235.
Vogel, JS, Southon, JR, Nelson, DE, Brown, TA. 1984. Performance of catalytically condensed carbon for use in accelerator mass spectrometry. Nuclear Instruments and Methods in Physics Research B 5(2):289–293.
Wacker, L, Němec, M, Bourquin, J. 2010. A revolutionary graphitisation system: fully automated, compact and simple. Nuclear Instruments and Methods in Physics Research B 268(7–8):931–934.
Wacker, L, Fülöp, RH, Hajdas, I, Molnár, M, Rethemeyer, J. 2013. A novel approach to process carbonate samples for radiocarbon measurements with helium carrier gas. Nuclear Instruments and Methods in Physics Research B 294:214–217.
Westgate, JA, Preece, SJ, Jackson, LE Jr. 2011. Revision of the tephrostratigraphy of the lower Sixtymile River area, Yukon Territory, Canada. Canadian Journal of Earth Science 48:695–701.
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Radiocarbon
  • ISSN: 0033-8222
  • EISSN: 1945-5755
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