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    Microscale AMS 14C Measurement at NOSAMS

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    Author
    Pearson, Ann
    McNichol, Ann P.
    Schneider, Robert J.
    Von Reden, K. F.
    Zheng, Yan
    Issue Date
    1998-01-01
    Keywords
    combustion
    isotope fractionation
    mathematical methods
    size
    C 14 C 12
    accuracy
    graphite
    native elements
    data processing
    accelerator mass spectroscopy
    mass spectroscopy
    spectroscopy
    sample preparation
    methods
    C 14
    carbon
    isotopes
    radioactive isotopes
    carbon dioxide
    stable isotopes
    absolute age
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    Citation
    Pearson, A., McNichol, A. P., Schneider, R. J., Von Reden, K. F., & Zheng, Y. (1998). Microscale AMS 14C measurement at NOSAMS. Radiocarbon, 40(1), 61-75.
    Publisher
    Department of Geosciences, The University of Arizona
    Journal
    Radiocarbon
    Description
    From the 16th International Radiocarbon Conference held in Gronigen, Netherlands, June 16-20, 1997.
    URI
    http://hdl.handle.net/10150/653650
    DOI
    10.1017/S0033822200017902
    Additional Links
    http://radiocarbon.webhost.uits.arizona.edu/
    Abstract
    Techniques for making precise and accurate radiocarbon accelerator mass spectrometry (AMS) measurements on samples containing less than a few hundred micrograms of carbon are being developed at the NOSAMS facility. A detailed examination of all aspects of the sample preparation and data analysis process shows encouraging results. Small quantities of CO2 are reduced to graphite over cobalt catalyst at an optimal temperature of 605 degrees C. Measured 14C/12C ratios of the resulting targets are affected by machine-induced isotopic fractionation, which appears directly related to the decrease in ion current generated by the smaller sample sizes. It is possible to compensate effectively for this fractionation by measuring samples relative to small standards of identical size. Examination of the various potential sources of background 14C contamination indicates that the sample combustion process is the largest contributor, adding ca. 1 micrograms of carbon with a less-than-modern 14C concentration.
    Type
    Proceedings
    text
    Language
    en
    ISSN
    0033-8222
    ae974a485f413a2113503eed53cd6c53
    10.1017/S0033822200017902
    Scopus Count
    Collections
    Radiocarbon, Volume 40, Number 1 (1998)

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