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dc.contributor.authorHogg, Alan G.
dc.contributor.authorFifield, L. Keith
dc.contributor.authorPalmer, Jonathan G.
dc.contributor.authorTurney, Chris S.M.
dc.contributor.authorGalbraith, Rex
dc.coverage.spatialKeble Coll, Oxford, ENGLANDen_NZ
dc.date.accessioned2010-03-08T02:21:33Z
dc.date.available2010-03-08T02:21:33Z
dc.date.issued2007
dc.identifier.citationHogg, A. G., Fifield, L.K., Palmer, J. G., Turney, C. S. M. & Galbraith, R. (2007). Robust radiocarbon dating of wood samples by high-sensitivity liquid scintillation spectroscopy in the 50–70 kyr age range. Radiocarbon, 49(2), 379-391.en
dc.identifier.urihttps://hdl.handle.net/10289/3684
dc.description.abstractAlthough high-sensitivity liquid scintillation (LS) spectroscopy is theoretically capable of producing finite radiocarbon ages in the 50,000- to 70,000-yr range, there is little evidence in the literature that meaningful dates in this time period have been obtained. The pressing need to undertake calibration beyond 26 kyr has resulted in the regular publication of ¹⁴C results in excess of 50 kyr, yet very little effort has been made to demonstrate their accuracy or precision. There is a paucity of systematic studies of the techniques required to produce reliable dates close to background and the methods needed to assess contamination from either in situ sources or laboratory handling and processing. We have studied the requirements for producing accurate and reliable dates beyond 50 kyr. Laboratory procedures include optimization of LS spectrometers to obtain low and stable non-¹⁴C background count rates, use of low-background counting vials, large benzene volumes, long counting times, and preconditioning of vacuum lines. We also discuss the need for multiple analyses of a suitable material containing no original ¹⁴C (background blank) and the application of an appropriate statistical model to compensate for variability in background contamination beyond counting statistics. Accurate and reproducible finite ages >60 kyr are indeed possible by high-sensitivity LS spectroscopy, but require corroborating background blank data to be defensible.en
dc.format.mimetypeapplication/pdf
dc.language.isoen
dc.publisherUniversity of Arizona, Department of Geosciencesen_NZ
dc.relation.urihttps://www.uair.arizona.edu/holdings/journal?r=http://radiocarbon.library.arizona.edu/en
dc.rightsThis article has been published in the journal: Radiocarbon. © 2007 by the Arizona Board of Regents on behalf of the University of Arizona. Used with permission.en
dc.subjectliquid scintillationen
dc.titleRobust radiocarbon dating of wood samples by high-sensitivity liquid scintillation spectroscopy in the 50–70 kyr age rangeen
dc.typeJournal Articleen
dc.identifier.doi10.1017/S0033822200042314en_NZ
dc.relation.isPartOfRadiocarbonen_NZ
pubs.begin-page379en_NZ
pubs.elements-id34256
pubs.end-page391en_NZ
pubs.issue2en_NZ
pubs.volume49en_NZ


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