scholarly journals Florida State University Radiocarbon Dates IV

Radiocarbon ◽  
1971 ◽  
Vol 13 (1) ◽  
pp. 19-25 ◽  
Author(s):  
S. J. Daugherty ◽  
J. R. Martin ◽  
D. S. Phelps
Keyword(s):  
Oxalic Acid ◽  
Half Life ◽  
Liquid Scintillation ◽  
Florida State University ◽  
State University ◽  
Liquid Scintillation Spectrometry ◽  
Radiocarbon Dates ◽  
Counting Error ◽  
The One

This list includes mainly the results of datings done from 1967 to 1969. Methods are essentially the same as those described in Radiocarbon, 1966, v. 8, p. 46–53, 1967, v. 9, p. 38–42, and 1969, v. 11, p. 15–21. Samples synthesized to benzene and counted by liquid scintillation spectrometry. Age calculations are based on 95% of the activity of the NBS oxalic acid standard and computed from the Libby half-life of 5570 yr and reference A.D. 1950. The error listed is the one-sigma statistical counting error. Most samples were counted for 2000 to 3000 min. HCL and NaOH pretreatments were applied to samples as required.

scholarly journals Florida State University Radiocarbon Dates III

Radiocarbon ◽  
1969 ◽  
Vol 11 (01) ◽  
pp. 15-21
Author(s):  
J. R. Martin ◽  
H. G. Goodell
Keyword(s):  
Oxalic Acid ◽  
Liquid Scintillation ◽  
Florida State University ◽  
State University ◽  
Liquid Scintillation Spectrometer ◽  
Radiocarbon Dates

Age calculations in this list include samples dated since January, 1967. Samples are converted to benzene and counted in a liquid scintillation spectrometer. Operations are essentially the same as those described in Radiocarbon, 1966, v. 8, p. 46–53 and Radiocarbon, 1967, v. 9, p. 38–42. Modern reference is 95% the activity of NBS oxalic acid standard, not age-corrected wood as reported in Radiocarbon, 1966, v. 8, p. 46–53.

scholarly journals Tartu Radiocarbon Dates XIII

Radiocarbon ◽  
1994 ◽  
Vol 36 (1) ◽  
pp. 153-158
Author(s):  
Arvi Liiva ◽  
Ilze Loze
Keyword(s):  
Standard Deviation ◽  
Oxalic Acid ◽  
Liquid Scintillation Counting ◽  
Half Life ◽  
Liquid Scintillation ◽  
Standard Sample ◽  
Scintillation Counting ◽  
Radiocarbon Dates ◽  
Academy Of Sciences ◽  
Modern Standard

This date list reports dates of archaeological samples of Mesolithic and Neolithic sites of Estonia, Latvia and Lithuania. We use liquid scintillation counting at the Geochemical and Statistical Laboratory of the Institute of Zoology and Botany, Estonian Academy of Sciences. Our modern standard is benzene enriched in 14C and its activity is checked with an NBS oxalic acid standard sample. Dates are given in conventional 14C years, based on the Libby half-life of 5570 ± 30 yr. AD 1950 is the reference year. Errors are based on one standard deviation calculated from count rates.

scholarly journals UCLA Radiocarbon Dates V

Radiocarbon ◽  
1966 ◽  
Vol 8 ◽  
pp. 467-497 ◽  
Author(s):  
Rainer Berger ◽  
W. F. Libby
Keyword(s):  
Oxalic Acid ◽  
Proportional Counter ◽  
Half Life ◽  
Count Rate ◽  
Radiocarbon Dates ◽  
Counting Error ◽  
Energy Channels ◽  
Sixth International

The measurements reported have been carried out during 1965 in the Isotope Laboratory of the Institute of Geophysics and Planetary Physics as a continuation of the UCLA date lists I through IV. Samples were analyzed as CO2-gas at one atm in a 7.5 L proportional counter with three energy channels. Dates have been calculated on the basis of a 5568 yr half-life as was recommended by the Sixth International C11 and H3 Dating Conference, June 1965, in Pullman, Washington. The standard for the contemporary biosphere remains as 95% of the count rate of NBS oxalic acid for radiocarbon laboratories. Background determinations have been made with CO2 obtained from marble. The error listed is always at least a one-sigma statistical counting error.

scholarly journals U. S. Geological Survey Radiocarbon Dates VII

Radiocarbon ◽  
1964 ◽  
Vol 6 ◽  
pp. 37-76 ◽  
Author(s):  
Patricia C. Ives ◽  
Betsy Levin ◽  
Richard D. Robinson ◽  
Meyer Rubin
Keyword(s):  
Solid State ◽  
External Field ◽  
Half Life ◽  
Geological Survey ◽  
Radiocarbon Dates ◽  
Solid State Electronics ◽  
Counting Error ◽  
Atmospheric Variations ◽  
The One

This date list contains the results of measurements made during 1961, 1962 and 1963. The method of counting, utilizing acetylene gas, remains essentially unchanged, except for the addition of some solid state electronics. The method of computation, using the Libby half-life of 5568 ± 30 yr, is continued. The error listed is always larger than the one-sigma statistical counting error commonly used, and takes into account known uncertainty laboratory factors, and does not include external (field or atmospheric) variations.Unless otherwise stated, collectors of all samples are members of the U. S. Geological Survey.

scholarly journals University of Georgia Radiocarbon Dates V

Radiocarbon ◽  
1976 ◽  
Vol 18 (3) ◽  
pp. 362-370 ◽  
Author(s):  
John E Noakes ◽  
Betty Lee Brandau
Keyword(s):  
Oxalic Acid ◽  
Half Life ◽  
Radiocarbon Dates ◽  
University Of Georgia ◽  
Counting Error ◽  
Statistical Variation ◽  
Sample Count ◽  
Counting Equipment

The following list of dates is compiled from samples prepared and catalogued since publication of our last date list (R, 1975, v 17, p 99-111). The counting equipment and operating procedures are the same. Ages are quoted with a 1σ counting error which includes statistical variation of the sample count as well as for background and standard, using ad 1950 as the reference year and 95% NBS oxalic acid for 14C dating as the standard. The half-life value used is 5570 years.

scholarly journals U. S. Geological Survey Radiocarbon Dates VIII

Radiocarbon ◽  
1965 ◽  
Vol 7 ◽  
pp. 372-398 ◽  
Author(s):  
Betsy Levin ◽  
Patricia C. Ives ◽  
Charles L. Oman ◽  
Meyer Rubin
Keyword(s):  
External Field ◽  
Half Life ◽  
Geological Survey ◽  
Radiocarbon Dates ◽  
Counting Error ◽  
Atmospheric Variations ◽  
The One

This list contains the results of measurements made during 1963 and 1964. Samples are counted in the form of acetylene gas, as previously, and ages computed using the Libby half-life of 5568 ± 30 yr. The error listed is always larger than the one-sigma statistical counting error commonly used, takes into account known uncertainty laboratory factors, but does not include external (field or atmospheric) variations.

scholarly journals Florida State University Radiocarbon Dates I

Radiocarbon ◽  
1966 ◽  
Vol 8 ◽  
pp. 46-53 ◽  
Author(s):  
J. J. Stipp ◽  
G. A. Knauer ◽  
H. G. Goodell
Keyword(s):  
Natural Radioactivity ◽  
Liquid Scintillation ◽  
Florida State University ◽  
State University ◽  
Liquid Scintillation Spectrometer ◽  
Radiocarbon Dates ◽  
Archaeological Chronologies

Laboratory construction was begun in December 1964 and routine dating was in progress by late February 1965. The primary purpose of this facility is to assist in marine geological studies and the archaeological chronologies of the region. Dating is carried out by utilizing the techniques of liquid scintillation described by Noakes et al. (1965), wherein the carbon of the sample to be dated is converted to benzene and the natural radioactivity detected in a liquid scintillation spectrometer.

scholarly journals University of Miami Radiocarbon Dates II

Radiocarbon ◽  
1975 ◽  
Vol 17 (1) ◽  
pp. 112-120 ◽  
Author(s):  
J J Stipp ◽  
K L Eldridge
Keyword(s):  
Oxalic Acid ◽  
Half Life ◽  
Liquid Scintillation ◽  
Liquid Scintillation Spectrometer ◽  
Radiocarbon Dates ◽  
Laboratory Procedures ◽  
University Of Miami ◽  
Modern Standard

The following list of dates are selected from geologic and archaeologic samples measured in late 1973. The laboratory procedures and techniques are the same as indicated in R, 1974, v 16, p 402–408, where sample is synthesized to benzene and counted for 24 hours in either a Beckman LS-100-C or Packard 2311 liquid scintillation spectrometer. Ages are calculated relative to 0.95 x NBS oxalic acid using a 14C half-life of 5568 years. The quoted error is 1σ, which includes only the counting uncertainties of the background, modern standard, and sample. Sample descriptions and comments were written in collaboration with collectors and submitters.

scholarly journals U. S. Geological Survey Radiocarbon Dates XI

Radiocarbon ◽  
1970 ◽  
Vol 12 (1) ◽  
pp. 319-334 ◽  
Author(s):  
Beverly Marsters Sullivan ◽  
Elliott Spiker ◽  
Meyer Rubin
Keyword(s):  
External Field ◽  
Half Life ◽  
Geological Survey ◽  
Radiocarbon Dates ◽  
Counting Error ◽  
Atmospheric Variations ◽  
The One

This list contains the results of measurements made during 1967 and 1968. Samples are counted in the form of acetylene gas, as previously, and ages computed on the basis of the Libby half-life, 5568 ± 30 yr. The error listed, always larger than the one-sigma statistical counting error commonly used, takes into account variable laboratory factors, but does not include external (field or atmospheric) variations.

scholarly journals US Geological Survey, Reston, Virginia, Radiocarbon Dates XIV

Radiocarbon ◽  
1978 ◽  
Vol 20 (2) ◽  
pp. 283-312 ◽  
Author(s):  
Lea Kelley ◽  
Elliott Spiker ◽  
Meyer Rubin
Keyword(s):  
Half Life ◽  
Technical Assistance ◽  
Geological Survey ◽  
Radiocarbon Dates ◽  
Counting Error ◽  
The One

This list contains the results of some measurements made between 1966 and 1975, and includes some earlier unpublished dates. Samples are counted in the form of acetylene gas, as previously, and ages computed on the basis of the Libby half-life, 5568 ± 30 years. The dates have not been corrected for fractionation by making a 13C measurement. The error listed, always larger than the one-sigma statistical counting error commonly used, takes into account possible fractionation in the laboratory and in nature and variability experienced with replicate samples. We thank Linda Wilt for helping in the preparation of the manuscript and Charles Oman for his technical assistance.

Sign in / Sign up

Export Citation Format

Share Document