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UCLA Radiocarbon Dates IX∗

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 1968 in the Isotope Laboratory of the Institute of Geophysics and Planetary Physics as a continuation of the UCLA date lists I through VIII. Samples were analyzed as CO2-gas at close to one atm in a 7.5 L proportional counter with three energy channels described in earlier publication. Radiocarbon ages have been calculated for uniformity on the basis of a 5568 yr half-life in accord with a recommendation 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 for fractionation. All samples were subjected to accepted NaOH, HCl or other special chemical pretreatments discussed below depending on the individual case to exclude contamination.

Type
Research Article
Information
Radiocarbon , Volume 11 , Issue 1 , 1969 , pp. 194 - 209
Copyright
Copyright © The American Journal of Science 

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