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National Physical Laboratory Radiocarbon Measurements IV

  • W. J. Callow (a1), M. J. Baker (a1) and Geraldine I. Hassall (a1)
Extract

The following list comprises measurements made since those reported in NPL III and is complete to the end of November 1965.

Ages are relative to A.D. 1950 and are calculated using a half-life of 5568 yr. The measurements, corrected for fractionation (quoted δC13 values are relative to the P.D.B. standard), are referred to 0.950 times the activity of the NBS oxalic acid as contemporary reference standard. The quoted uncertainty is one standard deviation derived from a proper combination of the parameter variances as described in detail in NPL III. These variances are those of the standard and background measurements over a rolling twenty week period, of the sample δC14 and δC13 measurements and of the de Vries effect (assumed to add an additional uncertainty equivalent to a standard deviation of 80 yr). Any uncertainty in the half-life has been excluded so that relative C14 ages may be correctly compared. Absolute age assessments, however, should be made using the accepted best value for the half-life and the appropriate uncertainty then included. If the net sample count rate is less than 4 times the standard error of the difference between the sample and background count rates, a lower limit to the age is reported corresponding to a net sample count rate of 4 times the standard error of this difference.

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Copyright
References
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Date lists:

UCLA IV Berger, Fergusson and Libby, 1965

NPL II Callow, Baker and Pritchard, 1964

NPL III Callow, Baker and Hassall, 1965

Berger, R., Fergusson, G. J., Libby, W. F., UCLA radiocarbon dates IV: Radiocarbon, v. 7, p. 336371.
Callow, W. J., Baker, M. J., and Pritchard, D. H., 1964, National Physical laboratory radiocarbon measurements II: Radiocarbon, v. 6, p. 2530.
Callow, W. J., Baker, M. J., and Hassall, G. I., 1965, National Physical Laboratory radiocarbon measurements III: Radiocarbon, v. 7, p. 156161.
Charlesworth, J. K., 1929, The South Wales End-Moraine: Q.J.G.S., v. 85, p. 335358.
Clark, J. G. D., and Godwin, H., 1962, The Neolithic in the Cambridgeshire Fens: Antiquity, v. 36, no. 141, p. 1023.
Farrand, W. R., and Gadja, R. T., 1962, Isobases on the Wisconsin Marine Limit in Canada: Geol. Bull. 17, Canadian Dept. of Mines and Technical Surveys.
Godwin, H., 1943, Coastal peat beds of the British Isles and North Sea: Jour. Ecology, v. 31, no. 2, p. 199247.
Godwin, H., 1945, Coastal peat beds of the North Sea region as indices of land and sea level changes: New Phytologist, v. 44, p. 2965.
Godwin, H., Suggate, R. P., and Willis, E. H., 1958 Radiocarbon dating of the eustatic rise in ocean-level: Nature, v. 181, p. 15181519.
Green, R. D., and Askew, P. W., 1959, Report Soil Survey Research Board No. 11, p. 22.
Ives, J. D., 1963, Field problems in determining the maximum extent of Pleistocene Glaciation along the Eastern Canadian Seaboard—a geographer's point of view; in North Atlantic Biota and their History, ed. Love, A. and Love, D.: Pergamon Press, Oxford.
Jelgersma, S., 1961, Holocene sea level changes in the Netherlands: Meded. Geol. Sticht, serie C. VI, no. 7, p. 985.
John, B. S., 1965, A possible Main Würm glaciation in West Pembrokeshire: Nature, v. 207, no. 4997, p. 622623.
Lewis, W. V., and Balchin, W. G. V., 1940, Past sea levels at Dungeness: Geog. Journal, v. 96, p. 258285.
Matthews, B., 1962, Glacial and post-glacial geomorphology of the Suglok-Wolstenholme area. Northern Ungava: McGill Sub-Arctic Research Papers, no. 12.
Matthews, B., 1963, Glacial geomorphological investigations in Northern Ungava, Quebec, Canada: Ice, no. 12, p. 910.
Matthews, B., 1964, The Late-Pleistocene glaciation and deglaciation of Northernmost Ungava, Quebec: Unpub. reports presented to the Arctic Inst. of North America, Washington Office, p. 94.
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Zeuner, F. E., 1959, The Pleistocene Period: Hutchingson, London, p. 145
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Radiocarbon
  • ISSN: 0033-8222
  • EISSN: 1945-5755
  • URL: /core/journals/radiocarbon
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