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UCLA Radiocarbon Dates VII∗

Published online by Cambridge University Press:  18 July 2016

Rainer Berger  and
W. F. Libby
Rainer Berger
Affiliation:
Institute of Geophysics, University of California, Los Angeles 90024
W. F. Libby
Affiliation:
Institute of Geophysics, University of California, Los Angeles 90024
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The measurements reported have been carried out during the first half of 1967 in the Isotope Laboratory of the Institute of Geophysics and Planetary Physics as a continuation of the UCLA date lists I through VI. Samples were analyzed as CO2-gas at close to one atm in a 7.5 L proportional counter with 3 energy channels described earlier. Radiocarbon ages have been calculated for uniformity 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 1σ statistical counting error. In critical cases C13/C12 isotope ratio measurements were made to correct the dates for fractionation. All samples were subjected to accepted NaOH and/or HCl pretreatments depending on the individual case as a minimum to exclude contamination. The annual curve for the atmospheric C14 content at China Lake, California, will be published in the next date list.

Type
Research Article
Information
Radiocarbon , Volume 10 , Issue 1 , 1968 , pp. 149 - 160
Copyright
Copyright © The American Journal of Science 

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