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University of Texas At Austin Radiocarbon Dates XIII

Published online by Cambridge University Press:  18 July 2016

S Valastro Jr. ,
E Mott Davis  and
Alejandra G Varela
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
Alejandra G Varela
Affiliation:
Radiocarbon Laboratory, Balcones Research Center, The University of Texas at Austin
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This list reports certain 14C measurements completed by November 1978; other projects completed by this time will be reported later. Age calculations are based on 14C half-life of 5568yr and modern standard of 95% NBS oxalic acid, supplemented by tree rings of pre-industrial wood from a log cut in the 1850's (Tx-540; R, 1970, v 12, p 249). Deviations reported are based on counting statistics of sample, background and modern, and are ± 1σ, except that when sample count approaches either modern or background, 2σ limits are reported. Unless noted, 12C/13C measurements were not made and results are not corrected for 13C fractionation (assumed ratio = −25‰ WRT PDB). Our laboratory uses liquid scintillation counting of benzene, with Li2C2 and vanadium-activated catalyst in preparation; chemical yields range between 95% and 99%. Three counters are employed; a Packard Tri-Carb Model 3002 and 2 Beckman LS320 spectrometers obtained through a grant from the National Science Foundation.

Type
Date Lists
Information
Radiocarbon , Volume 21 , Issue 2 , 1979 , pp. 257 - 273
Copyright
Copyright © The American Journal of Science 

References

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