University of Texas At Austin Radiocarbon Dates XI
| Autor: | S Valastro, E Mott Davis, Alejandra G Varela |
|---|---|
| Rok vydání: | 1977 |
| Předmět: | |
| Zdroj: | Radiocarbon. 19:280-325 |
| ISSN: | 1945-5755 0033-8222 |
| Popis: | This list reports14C measurements completed between August 1973 and November 1975. Other projects completed in that period will be reported later. Age calculations are based on14C half-life of 5568 yr 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 for13C fractionation. The laboratory uses liquid scintillation counting of benzene, with Li2C2and 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 LS-230 spectrometers obtained through a grant from the National Science Foundation. |
| Databáze: | OpenAIRE |
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