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    Radiocarbon Dating Problems Using Acetylene as Counting Gas

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    Author
    Geyh, Mebus A.
    Issue Date
    1990-01-01
    Keywords
    counting gas
    Hannover Laboratory
    lithium
    aliphatic hydrocarbons
    acetylene
    alkynes
    decontamination
    alkali metals
    hydrocarbons
    techniques
    metals
    organic compounds
    organic materials
    sample preparation
    methods
    C 14
    carbon
    isotopes
    radioactive isotopes
    carbon dioxide
    absolute age
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    Citation
    Geyh, M. A. (1990). Radiocarbon dating problems using acetylene as counting gas. Radiocarbon, 32(3), 321-324.
    Publisher
    Department of Geosciences, The University of Arizona
    Journal
    Radiocarbon
    Description
    From the International Workshop on Intercomparison of Radiocarbon Laboratories.
    URI
    http://hdl.handle.net/10150/653097
    DOI
    10.1017/S0033822200012947
    Additional Links
    http://radiocarbon.webhost.uits.arizona.edu/
    Abstract
    An investigation of inconsistent Hannover results in the International Collaborative Study (ICS) led to the conclusion that the main reason was contamination of the acetylene used as counting gas with recent and/or fossil carbon by the lithium used for its preparation. Despite the high level of purity of the lithium guaranteed by the producer and storage under argon in cans, different charges were partly covered with contemporary lithium carbonate and fossil oil sometimes was used to preserve the metal. Thorough cleaning of the surface of the lithium rods decreased the contamination but did not remove it entirely, which is evidenced in the wider scatter of the counting rates of various background gases than that of radiocarbon-free tank acetylene. As a result of the high risk of contamination with fossil and/or recent carbon from the acetylene counting gas, the high price of lithium, and the time-consuming preparation, the Hannover 14C Laboratory will use carbon dioxide instead of acetylene as counting gas in the future.
    Type
    Proceedings
    text
    Language
    en
    ISSN
    0033-8222
    ae974a485f413a2113503eed53cd6c53
    10.1017/S0033822200012947
    Scopus Count
    Collections
    Radiocarbon, Volume 32, Number 3 (1990)

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