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UCLA Radiocarbon Dates IV

  • Rainer Berger (a1), G. J. Fergusson (a1) and W. F. Libby (a1)
Extract

The measurements reported in this list have been carried out in the Isotope Laboratory of the Institute of Geophysics and Planetary Physics during 1964. They are a continuation of the previously reported date lists UCLA I, II and III. The same counting procedure has been continued: CO2 proportional counting at 1 atm of pressure in a 7.5 L counter with three energy channels. Dates have been calculated according to the recommendations of the Fifth Radiocarbon Conference, Cambridge, 1962, on the basis of a radiocarbon half-life of 5568 yr (Godwin, 1962). The modern standard for organic samples has been based on 95% of the count rate of NBS oxalic acid for radiocarbon laboratories. Background measurements are determined with CO2 derived from marble. The ages of carbonate-containing substances such as shells and tufa have been calculated on the basis of estimates for the corresponding contemporary C14 activity (Broecker and Walton, 1959), as discussed in the respective sample descriptions. New methods of sample preparation are described in context with the date listings.

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Copyright
Corresponding author
∗∗ Present address: Johnston Laboratories, Inc., Baltimore, Maryland.
References
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Date lists:

Arizona I Wise and Shutler, 1958

Arizona IV Damon, Long and Sigalove, 1963

Groningen V Vogel and Waterbolk, 1964

La Jolla IV Hubbs, Bien and Suess, 1965

Lamont IV Broecker and Kulp, 1957

Michigan II Crane and Griffin, 1958

Michigan III Crane and Griffin, 1958

Ohio Wesleyan University I Ogden and Hay, 1964

Smithsonian Institution II Long, 1965

Southern Rhodesia I Robins and Swart, 1964

Tata Institute II Agrawal, Kusumgar, Lal and Sarna, 1964

UCLA I Fergusson and Libby, 1962

UCLA II Fergusson and Libby, 1963

UCLA III Fergusson and Libby, 1964

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Radiocarbon
  • ISSN: 0033-8222
  • EISSN: 1945-5755
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