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Graphitization of Small Carbonate Samples for Paleoceanographic Research at the Godwin Radiocarbon Laboratory, University of Cambridge

  • E Freeman (a1), L C Skinner (a1), R Reimer (a2), A Scrivner (a1) and S Fallon (a3)...
Abstract
Abstract

A new radiocarbon preparation facility was set up in 2010 at the Godwin Laboratory for Palaeoclimate Research, at the University of Cambridge. Samples are graphitized via hydrogen reduction on an iron powder catalyst before being sent to the Chrono Centre, Belfast, or the Australian National University for accelerator mass spectrometry (AMS) analysis. The experimental setup and procedure have recently been developed to investigate the potential for running small samples of foraminiferal carbonate. By analyzing background values of samples ranging from 0.04 to 0.6 mg C along with similar sized secondary standards, the setup and experimental procedures were optimized for small samples. “Background” modern 14C contamination has been minimized through careful selection of iron powder, and graphitization has been optimized through the use of “small volume” reactors, allowing samples containing as little as 0.08 mg C to be graphitized and accurately dated. Graphitization efficiency/fractionation is found not to be the main limitation on the analysis of samples smaller than 0.07 mg C, which rather depends primarily on AMS ion beam optics, suggesting further improvements in small sample analysis might yet be achieved with our methodology.

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Corresponding author
*Corresponding author. Email: ef276@cam.ac.uk.
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This list contains references from the content that can be linked to their source. For a full set of references and notes please see the PDF or HTML where available.

E Delqué-Količ , I Caffy , C Comby-Zerbino , J-P Dumoulin , S Hain , M Massault , C Moreau , A Quiles , V Setti , C Souprayen , J-F Tannau , B Thellier , J Vincent . 2013. Advances in handling small radiocarbon samples at the Laboratoire de Mesure du Carbone 14 in Saclay, France. Radiocarbon 55(2–3):648656.

M Le Clercq , J van der Plicht , M Groning . 1998. New 14C reference materials with activities of 15 and 50 pMC. Radiocarbon 40(1):295297.

GM Santos , JR Southon , S Griffin , SR Beaupre , ERM Druffel . 2007. Ultra small-mass AMS 14C sample preparation and analyses at KCCAMS/UCI Facility. Nuclear Instruments and Methods in Physics Research B 259(1):293302.

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Radiocarbon
  • ISSN: 0033-8222
  • EISSN: 1945-5755
  • URL: /core/journals/radiocarbon
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