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University of Texas at Austin Radiocarbon Dates VI

Published online by Cambridge University Press:  18 July 2016

S. Valastro Jr. ,
E. Mott Davis  and
Craig T. Rightmire
S. Valastro Jr.
Affiliation:
Radiocarbon Laboratory, Balcones Research Center, The University of Texas at Austin
E. Mott Davis
Affiliation:
Radiocarbon Laboratory, Balcones Research Center, The University of Texas at Austin
Craig T. Rightmire
Affiliation:
Radiocarbon Laboratory, Balcones Research Center, The University of Texas at Austin
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This laboratory is now a part of the Bureau of Economic Geology, The University of Texas at Austin. The present list reports C14 measurements made in dating projects completed in the year ending November, 1967, and some measurements for projects still in progress. Age calculations are based on C14 half-life of 5568 yr and a modern standard of 95% of NBS oxalic acid. The deviations reported are based on the counting statistics of the sample, background, and modern, and are ± 1σ except that when the sample count approaches either the modern or the background, 2σ limits are reported. The laboratory continues to use liquid scintillation counting of benzene, using Li2C2 and vanadium activated catalyst in preparation, as described in Texas IV and earlier lists. Chemical yields now average 85%.

Rightmire's caliche dating (done for an M.A. thesis in the Dept. of Geol.) is the principal project reported in this list; in addition to the research he prepared the samples in our laboratory and wrote the statements which accompany the list. Valastro is in charge of all technical operations in the laboratory, and he and Davis share the administrative responsibilities. Davis, who handles sample screening (with the aid of an Advisory Committee) and archaeological appraisal, compiled the list.

Type
Research Article
Information
Radiocarbon , Volume 10 , Issue 2 , 1968 , pp. 384 - 401
Copyright
Copyright © The American Journal of Science 

References

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