Hostname: page-component-cd9895bd7-dk4vv Total loading time: 0 Render date: 2024-12-26T07:38:34.195Z Has data issue: false hasContentIssue false
  • English
  • Français

Instituto Venezolano De Investigaciones Cientificas Natural Radiocarbon Measurements IV

Published online by Cambridge University Press:  18 July 2016

M. A. Tamers
M. A. Tamers*
Affiliation:
Instituto Venezolano de Investigaciones Científicas, Department of Chemistry, Caracas, Venezuela
Rights & Permissions [Opens in a new window]

Extract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

The laboratory renewed operations in January, 1968 after a year's inactivity due to the absence of the head, who was on leave at the University of Bonn. Synthesized benzene continues as the dating medium, but various improvements have been made on the chemical method in order to increase capacity. Combustions are no longer carried out for normal materials. Instead, charcoal samples are used directly (after the usual pretreatment) and wood, plants, cloth, etc. are carbonized in a nitrogen atmosphere. Charring is a considerably more rapid procedure than combustion since it eliminates the CO2 collection, carbonate precipitation, and filtration steps. The charcoal then is reacted with molten lithium metal. Also, it was found that carbonates are attacked directly by hot lithium to produce carbides and the preliminary generation of CO2 gas is not indispensable. The carbide, cooled to room temperature, is reacted with old water (IVIC-317, Radiocarbon, 1967, v. 9, p. 240), the acetylene separated from hydrogen in a double liquid nitrogen-cooled trap, and benzene produced with a chromium activated silica-alumina catalyst.

Type
Research Article
Information
Radiocarbon , Volume 11 , Issue 2 , 1969 , pp. 396 - 422
Copyright
Copyright © The American Journal of Science 

References

Date lists: Google Scholar
Bonn I Scharpenseel, , Pietig, , and Tamers, , 1968 Google Scholar
Groningen II de Vries, , Barendsen, , and Waterbolk, , 1958 Google Scholar
IVIC I Tamers, , 1965 Google Scholar
IVIC II Tamers, , 1966 Google Scholar
IVIC III Tamers, , 1967 Google Scholar
Michigan VII Crane, and Griffin, , 1962 Google Scholar
Texas IV Pearson, , Davis, , and Tamers, , 1966 Google Scholar
UCLA VII Berger, and Libby, , 1968 Google Scholar
Yale IV Deevey, , Gralenski, , and Hoffren, , 1959 Google Scholar
Berdichevsky, , Scher, B., 1963, Publicación preliminar.: Rev. Antropología Santiago de Chile, no. 2, p. 65.Google Scholar
Berger, Rainer and Libby, W. F., 1968 UCLA radiocarbon dates VII: Radiocarbon, v. 10, p. 149–160.Google Scholar
Broecker, W. S., Olson, Edwin A., and Bird, Junius, 1959, Radiocarbon measurements on samples of known age: Nature, v. 183, p. 1582–1584.CrossRefGoogle Scholar
Crane, H. R. and Griffin, James B., 1962, University of Michigan radiocarbon dates VII: Radiocarbon, v. 4, p. 183–203.Google Scholar
Cruxent, José M., 1967, El paleo-indio en Taima-taima, estado Falcón, Venezuela: Acta Cient. Venezolana, Suppl. 3, p. 3–17.Google Scholar
Layrisse, Miguel and Wilbert, Johannes, 1966, Indian societies of Venezuela: Caracas, Fundación La Salle de Ciencias Naturales.Google Scholar
Nicmeyer, H. and Schiappacasse, V., 1963, Investigaciones arqueológicas en las terrazas de Conanoxa, Valle de Camarones, Provincia de Tarapacá: Rev. Univ. Año XLVIII.Google Scholar
Pearson, F. J. Jr., Davis, , Mott, E., and Tamers, M. A., 1966, University of Texas radiocarbon dates IV: Radiocarbon, v. 8, p. 453–466.Google Scholar
Pietig, F. and Scharpenseel, H. W., 1966, Alterbestimmung mit dem Flüssigkeits-Szintillations-Spektrometer. Ein neuer Katalysator zur Benzolsynthese: Atompraxis, v. 12, p. 95–97.Google Scholar
Rouse, Irving and Cruxent, J. M., 1963a, Venezuelan Archaeology: New Haven, Yale Univ. Press.Google Scholar
Rouse, Irving and Cruxent, J. M. 1963b, Recientes datos sobre fechas arqueológicas por el método de C14 en el occidente de Venezuela: Acta Cient. Venezolana, Suppl. 1, p. 3–10.Google Scholar
Scharpenseel, H. W., Pietig, F., and Tamers, M. A., 1968, Bonn radiocarbon measurements I: Radiocarbon, v. 10, p. 8–28.Google Scholar
Schiappacasse, V. and Niemeyer, H., 1964, Excavaciones de un conchal en el pueblo de Guanaqueros, in: Arqueología de Chile Central y Areas Vecinas, p. 235.Google Scholar
Stuiver, Minze and Suess, H. E., 1966, On the relationship between radiocarbon dates and true sample ages: Radiocarbon, v. 8, p. 534–540.Google Scholar
Suárez, María Matilde, 1968, Los Warao: Caracas, Ed. Sucre.Google Scholar
Tamers, M. A., 1965, Instituto Venezolano de Investigaciones Científicas natural radiocarbon measurements I: Radiocarbon, v. 7, p. 54–65.Google Scholar
Tamers, M. A. and Pearson, F. J. Jr., 1965, Validity of radiocarbon dates on bone: Nature, v. 208, p. 1053–1055.Google Scholar
Tamers, M. A., 1966, Instituto Venezolano de Investigaciones Científicas natural radiocarbon measurements II: Radiocarbon, v. 8, p. 204–212.Google Scholar
Tamers, M. A. 1967a, Instituto Venezolano de Investigaciones Científicas natural radiocarbon measurements III: Radiocarbon, v. 9, p. 237–245.Google Scholar
Tamers, M. A. 1967b, Evolution de la concentration du radiocarbone dans les basses latitudes de l'hémisphère Nord pendant les dernières années: Comptes Rendus, v. 264B, p. 344–347.Google Scholar
Tamers, M. A. 1969, Radiocarbon dating of recent events: Atompraxis, in press.Google Scholar
Taylor, R. E. and Berger, Rainer, 1967, Radiocarbon content of marine shells from the Pacific coasts of Central and South America: Science, v. 158, p. 1180–1182.CrossRefGoogle ScholarPubMed
Vaquero, Antonio, 1965, Idioma Warao: Caracas, Ed. Sucre.Google Scholar
Vries, H. de, Barendsen, G. W., and Waterbolk, H. T., 1958, Groningen radiocarbon dates II: Science, v. 127, p. 129–137.Google Scholar
Wagner, Erika, 1967, The prehistory and ethnohistory of the Carache area in western Venezuela: Yale Univ. Publ. in Anthropol. No. 71.Google Scholar
Zucchi, Alberta, 1965, Informe preliminar de las excavaciones del yacimiento La Betania, estado Barinas, Venezuela: Boletín Indigenista Venezolano, v. 10, 155–168.Google Scholar