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Published online by Cambridge University Press: 18 July 2016
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.
Publication number 561, Institute of Geophysicsand Planetary Physics, University of California,Los Angeles.