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UCLA Radiocarbon Dates VI*

Published online by Cambridge University Press:  18 July 2016

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 during1966 in the Isotope Laboratory of the Institute ofGeophysics and Planetary Physics as a continuationof the UCLA date lists I through V. Samples wereanalyzed as CO2-gas at one atm in a 7.5 Lproportional counter with three energy channels. Theall-solid-state unit is supplied with high voltagefrom a remarkably stable and interference-freebattery source. Radiocarbon ages have beencalculated on the basis of a 5568-yr half-life aswas recommended by the Sixth InternationalC14 and H3 DatingConference, June 1965, in Pullman, Washington. Thestandard for the contemporary biosphere remains as95% of the count rate of NBS oxalic acid forradiocarbon laboratories. Background determinationshave been based on CO2 obtained frommarble. The error listed is always at least aone-sigma statistical counting error. In criticalcases C13/C12 isotope ratiomeasurements were made to correct the dates. Allsamples were subjected to accepted pretreatmentsdiffering in the individual cases to excludecontamination.

Type
Research Article
Copyright
Copyright © The American Journal of Science 

Footnotes

*

Publication number 561, Institute of Geophysicsand Planetary Physics, University of California,Los Angeles.

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