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    A Simple, Extremely Stable Single-Tube Liquid Scintillation System for Radiocarbon Dating

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    Author
    Theodórsson, Páll
    Issue Date
    2005-01-01
    
    Metadata
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    Citation
    Theodórsson, P. (2005). A simple, extremely stable single-tube liquid scintillation system for radiocarbon dating. Radiocarbon, 47(1), 89-97.
    Publisher
    Department of Geosciences, The University of Arizona
    Journal
    Radiocarbon
    URI
    http://hdl.handle.net/10150/653520
    DOI
    10.1017/S003382220005222X
    Additional Links
    http://radiocarbon.webhost.uits.arizona.edu/
    Abstract
    This paper describes a simple and compact liquid scintillation radiocarbon dating system, ICELS, and demonstrates its long-term stability and reproducibility to a precision level rarely presented before, better than 0.04% (3 14C yr). Inexpensive systems of this kind may, in the future, help to meet increasing demand for high precision (+/16 to +/20 14C yr) and strict quality control. ICELS comprises a compact detector unit, where a 3-mL dome-shaped vial, with an optimal light reflector, sits on the top of a vertical 30-mm photomultiplier tube. Sample changing is manual. The high voltage is set at the balance point for each sample, securing maximal counting stability. The quench correction method used (spectrum restoration) corrects with 0.04% precision for all parameters that can normally shift the 14C spectrum. For 3 mL of benzene at 71% 14C counting efficiency (recent carbon 23 cpm), the background is 1.72 cpm behind a 5-cm-thick shield of lead (27 kg) and 1.53 cpm behind 10 cm of lead. The background count rate corrected for atmospheric pressure variations was completely stable over 47and 57-d testing periods for the 2 systems.
    Type
    Article
    text
    Language
    en
    ISSN
    0033-8222
    ae974a485f413a2113503eed53cd6c53
    10.1017/S003382220005222X
    Scopus Count
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    Radiocarbon, Volume 47, Number 1 (2005)

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