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UCLA Radiocarbon Dates VI *

  • Rainer Berger (a1) and W. F. Libby (a1)
Extract

The measurements reported have been carried out during 1966 in the Isotope Laboratory of the Institute of Geophysics and Planetary Physics as a continuation of the UCLA date lists I through V. Samples were analyzed as CO2-gas at one atm in a 7.5 L proportional counter with three energy channels. The all-solid-state unit is supplied with high voltage from a remarkably stable and interference-free battery source. Radiocarbon ages have been calculated on the basis of a 5568-yr half-life as was recommended by the Sixth International C14 and H3 Dating Conference, June 1965, in Pullman, Washington. The standard for the contemporary biosphere remains as 95% of the count rate of NBS oxalic acid for radiocarbon laboratories. Background determinations have been based on CO2 obtained from marble. The error listed is always at least a one-sigma statistical counting error. In critical cases C13/C12 isotope ratio measurements were made to correct the dates. All samples were subjected to accepted pretreatments differing in the individual cases to exclude contamination.

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References
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Date lists:

Arizona IV Damon, Long and Sigalove, 1963

Arizona V Damon, Haynes and Long, 1964

Arizona VI Haynes, Damon and Grey, 1966

British Museum I Barker and Mackey, 1959

British Museum III Barker and Mackey, 1961

Chicago Libby, 1955

Groningen III DeVries and Barendsen, 1958

Michigan VIII Crane and Griffin, 1963

Pennsylvania III Ralph, 1959

UCLA I Fergusson and Libby, 1962

UCLA II Fergusson and Libby, 1963

UCLA III Fergusson and Libby, 1964

UCLA IV Berger, Fergusson and Libby, 1965

UCLA V Berger and Libby, 1966

Uppsala I Olsson, 1959

Barker, H. and Mackey, C. J., 1959, British Museum natural radiocarbon measurements I: Radiocarbon, v. 1, p. 81.
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Berger, R., Taylor, R. E., and Libby, W. F., 1966, Radiocarbon content of marine shells from the California and Mexican west coast: Science, v. 153, p. 864.
Crane, H. R. and Griffin, J. B., 1963, University of Michigan radiocarbon dates VIII: Radiocarbon, v. 5, p. 228.
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Harrington, M. R., 1933, Gypsum Ceva, Nevada: Southwest Mus. Papers, no. 8.
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Horn, W., Born, E., and Berger, R., 1967, A victim of fire: the 15th century manor barn of Nettlestead, Kent: Aachener Kunstblätter, in press.
Horn, W., Charles, F. W. B., and Berger, R., 1966, The cruck-built barn of Middle Littleton, Worcestershire: Jour. Soc. Architectural Historians, v. 25, p. 221.
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Radiocarbon
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