scholarly journals University of Granada Radiocarbon Dates VIII

Radiocarbon ◽  
1997 ◽  
Vol 39 (3) ◽  
pp. 299-303
Author(s):  
Cecilio González-Gómez ◽  
Elena Villafranca-Sánchez
Keyword(s):  
Liquid Scintillation Counting ◽  
Radiocarbon Dating ◽  
Liquid Scintillation ◽  
Scintillation Counting ◽  
Boiling Temperature ◽  
Radiocarbon Dates ◽  
Standard Acid ◽  
Basic Procedure ◽  
The University

This paper includes determinations of archaeological, geological and paleobotanical samples from Spain and Brazil, measured at the University of Granada Radiocarbon Dating Laboratory, mainly from 1991 to 1992. As previously reported (González-Gómez 1992), pretreatment of charcoal and wood samples is a standard acid-basic procedure using 8% HCl and 2% NaOH at boiling temperature. The collagen of bone samples was extracted by the Longin (1971) method. The method of dating is liquid scintillation counting of synthesized benzene.

scholarly journals University of Granada Radiocarbon Dates V

Radiocarbon ◽  
1991 ◽  
Vol 33 (3) ◽  
pp. 367-373 ◽  
Author(s):  
Cecilio Gonzalez-Gomez ◽  
Purificacion Sanchez-Sanchez
Keyword(s):  
Liquid Scintillation Counting ◽  
Radiocarbon Dating ◽  
Liquid Scintillation ◽  
Scintillation Counting ◽  
Boiling Temperature ◽  
Liquid Scintillation Spectrometer ◽  
Radiocarbon Dates ◽  
Standard Acid ◽  
Basic Procedure ◽  
The University

This paper includes some determinations of archaeological, art and palaeobotanical samples from Spain and Portugal, obtained at the University of Granada Radiocarbon Dating Laboratory, mostly from 1986 to 1988. Pretreatment of charcoal and wood samples is a standard acid-basic procedure using 8% HC1 and 2% NaOH at boiling temperature. The collagen of bone samples is obtained by the Longin (1971) method.The method of dating is benzene synthesis and liquid scintillation counting as previously reported (González-Gómez, López-González & Domingo-García 1982; González-Gómez, Sánchez-Sánchez and Domingo-García 1985; González-Gómez, Sánchez-Sánchez and Villafranca-Sánchez 1986, 1987).14C activity was measured in a Packard Tri-Carb Mod 4640 liquid scintillation spectrometer, using 20 ml low 40K counting vials with 5 ml benzene and 10 ml PPO-toluene as scintillator with a background of ca. 9 cpm. Efficiency was approximately 70% using the part of spectrum above the end point of tritium.

scholarly journals University of Granada Radiocarbon Dates VII

Radiocarbon ◽  
1997 ◽  
Vol 39 (1) ◽  
pp. 73-77
Author(s):  
Cecilio González-Gómez ◽  
Elena Villafranca-Sánchez
Keyword(s):  
Liquid Scintillation Counting ◽  
Radiocarbon Dating ◽  
Liquid Scintillation ◽  
Scintillation Counting ◽  
Boiling Temperature ◽  
Radiocarbon Dates ◽  
Standard Acid ◽  
Basic Procedure ◽  
The University

This paper includes determinations of archaeological, geological and palaeobotanical samples from Spain and Portugal, measured at the University of Granada Radiocarbon Dating Laboratory, from 1990 to 1991. Pretreatment of charcoal and wood samples is a standard acid-basic procedure using 8% HCl and 2% NaOH at boiling temperature. The collagen of bone samples is obtained by the Longin (1971) method. The method of dating is benzene synthesis and liquid scintillation counting.

scholarly journals University of Texas Radiocarbon Dates II

Radiocarbon ◽  
1964 ◽  
Vol 6 ◽  
pp. 138-159 ◽  
Author(s):  
M. A. Tamers ◽  
F. J. Pearson ◽  
E. Mott Davis
Keyword(s):  
Chemical Synthesis ◽  
Liquid Scintillation Counting ◽  
Radiocarbon Dating ◽  
Liquid Scintillation ◽  
Scintillation Counting ◽  
Radiocarbon Dates ◽  
University Of Texas ◽  
The University

The Radiocarbon Dating Laboratory of the University of Texas was reorganized in late 1962. The dates reported in this list were obtained from February to November, 1963. The laboratory uses liquid scintillation counting with benzene solutions (Tamers, Stipp, and Collier, 1961; Noakeset al., 1963). The chemical synthesis has been modified and improved in several ways in order to permit one worker to produce a sample per day.

scholarly journals University of Granada Radiocarbon Dates VI

Radiocarbon ◽  
1992 ◽  
Vol 34 (1) ◽  
pp. 133-139 ◽  
Author(s):  
Cecilio Gonzalez-Gomez
Keyword(s):  
Radiocarbon Dating ◽  
Boiling Temperature ◽  
Radiocarbon Dates ◽  
Standard Acid ◽  
Basic Procedure ◽  
The University

This paper includes determinations of archaeological, geological, palaeobotanical and other samples from Spain, Portugal and Bolivia, measured at the University of Granada Radiocarbon Dating Laboratory, mostly from 1989 to 1990. Pretreatment of charcoal and wood samples is a standard acid-basic procedure using 8% HCl and 2% NaOH at boiling temperature. We obtain collagen from bone samples using the Longin (1971) method.

Department of Earth Sciences at the University of Rome Radiocarbon Dates II

Radiocarbon ◽  
1994 ◽  
Vol 36 (1) ◽  
pp. 133-142
Author(s):  
Gilberto Calderoni
Keyword(s):  
Liquid Scintillation Counting ◽  
Environmental Samples ◽  
Liquid Scintillation ◽  
Adriatic Sea ◽  
Northern Italy ◽  
Scintillation Counting ◽  
National Council ◽  
Radiocarbon Dates ◽  
University Of Rome ◽  
The University

This paper includes 14C measurements of geological and environmental samples processed by liquid scintillation counting of benzene between 1991 and the end of 1992. All samples, from central and northern Italy and from the Gulf of Venice, Adriatic Sea, relate to scientific projects conducted in collaboration with colleagues from both Italian universities and National Council of Research (CNR) institutions.

University of Granada Radiocarbon Dates I

Radiocarbon ◽  
1982 ◽  
Vol 24 (2) ◽  
pp. 217-221 ◽  
Author(s):  
Cecilio González-Gómez ◽  
Juan de D López-González ◽  
María Domingo-García
Keyword(s):  
Liquid Scintillation Counting ◽  
Radiocarbon Dating ◽  
Liquid Scintillation ◽  
Scintillation Counting ◽  
Pure Oxygen ◽  
Radiocarbon Dates

The Radiocarbon Dating Laboratory of The Granada University was established to support the work of archaeologists and geologists. The method of dating is benzene synthesis and liquid scintillation counting developed by a number of investigators (Polach and Stipp, 1967; Tamers, 1969; Pietig and Scharpenseel, 1966) with sample combustion in pure oxygen (Switsur, 1974).

scholarly journals Yale University Geology and Geophysics Radiocarbon Dates I

Radiocarbon ◽  
1977 ◽  
Vol 19 (1) ◽  
pp. 138-141 ◽  
Author(s):  
Y Nozaki ◽  
K K Turekian
Keyword(s):  
Liquid Scintillation Counting ◽  
Radiocarbon Dating ◽  
Liquid Scintillation ◽  
Scintillation Counting ◽  
Yale University ◽  
Radiocarbon Dates ◽  
Geochemical Parameters ◽  
Natural Tracer

A radiocarbon dating system has been established at the Department of Geology and Geophysics, Yale University. Liquid-scintillation counting of benzene described by Noakes et al (1965) and Polach and Stipp (1967) is used. The operation of the original Yale Radiocarbon Laboratory, based on counting CO2 gas, was suspended in 1969. The present facility is operated as part of the geochemical laboratories of the Department of Geology and Geophysics. The operation is small, geared to solving geochemical problems, through the use of radiocarbon as a dating tool and as a natural tracer in combination with other geochemical parameters. The facility will collaborate on significant archaeologic and geologic problems. However, it will not be a facility to which samples are submitted routinely. We believe that commercial facilities and other laboratories dedicated to such kinds of operation are better suited to handling such diversity and volume of samples.

scholarly journals University of Barcelona Radiocarbon Dates I

Radiocarbon ◽  
1991 ◽  
Vol 33 (3) ◽  
pp. 355-365
Author(s):  
J. S. Mestres ◽  
Gemma Rauret ◽  
J. F. Garcia
Keyword(s):  
Measurement Technique ◽  
Liquid Scintillation Counting ◽  
Liquid Scintillation ◽  
Sample Pretreatment ◽  
Scintillation Counting ◽  
Geological Samples ◽  
Radiocarbon Dates ◽  
The University ◽  
Serial Measurements

The Radiocarbon Laboratory at the University of Barcelona began its serial measurements in 1985. The following list contains dates obtained between 1985 and 1987. Both archaeological and geological samples were dated.The measurement technique we use is liquid scintillation counting of benzene. A previous paper (Mestres, García & Rauret 1991) describes sample pretreatment, synthesis and counting protocols and equipment.

scholarly journals University of Texas Radiocarbon Dates I

Radiocarbon ◽  
1962 ◽  
Vol 4 ◽  
pp. 43-50 ◽  
Author(s):  
J. J. Stipp ◽  
E. Mott Davis ◽  
John E. Noakes ◽  
Tom E. Hoover
Keyword(s):  
Liquid Scintillation Counting ◽  
Liquid Scintillation ◽  
Scintillation Counting ◽  
Successful Development ◽  
Radiocarbon Dates ◽  
University Of Texas ◽  
Two Systems ◽  
The University

The C14Dating Laboratory of the University of Texas has been working on the development of two systems of counting: gas counting with methane, and liquid scintillation counting with benzene. Lack of adequate instrumentation has retarded the work on gas counting, but the liquid scintillation work, supported in part by the Department of Chemistry, finally led to the successful development of a system in which the benzene counting solvent was synthesized from acetylene by pyrolysis (Tamers, Stipp, and Collier, 1961).

scholarly journals Simon Fraser University Radiocarbon Dates I

Radiocarbon ◽  
1982 ◽  
Vol 24 (3) ◽  
pp. 344-351 ◽  
Author(s):  
D E Nelson ◽  
K A Hobson
Keyword(s):  
Conversion Efficiency ◽  
Liquid Scintillation Counting ◽  
Chromatographic Analysis ◽  
Radiocarbon Dating ◽  
Liquid Scintillation ◽  
Reaction Vessel ◽  
Scintillation Counting ◽  
Radiocarbon Dates ◽  
Gas Chromatographic Analysis ◽  
Simon Fraser University

The SFU Archaeology Department has constructed a small radiocarbon dating facility to serve its own needs and, to the extent that time is available, the needs of other archaeologists and earth scientists. All dates reported here were processed by our laboratory from October 1979 to September 1980. The 14C measurements are made using conventional techniques for liquid scintillation counting of benzene. The samples are burned in a Phonon Mark IV combustion bomb and the resultant CO2 is purified and converted to Li2C2 using a reaction vessel based on the design of Polach, Gower, and Fraser (ms). Acetylene is formed by hydrolysis with distilled H2O which has been aged for a minimum of three months. The acetylene is trimerized to benzene with the Mobil Durabead I catalyst. The conversion efficiency of CO2 to C6H6 is typically 95%. Gas chromatographic analysis of typical samples of the synthesized benzene indicates 99.8% purity with toluene produced in trace amounts.

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