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 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 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 U.S. Geological Survey Radiocarbon Dates IX

Radiocarbon ◽  
1967 ◽  
Vol 9 ◽  
pp. 505-529 ◽  
Author(s):  
Patricia C. Ives ◽  
Betsy Levin ◽  
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 1965 and 1966. 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 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 U. S. Geological Survey Radiocarbon Dates X

Radiocarbon ◽  
1969 ◽  
Vol 11 (01) ◽  
pp. 210-227 ◽  
Author(s):  
Beverly Marsters ◽  
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, which 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 US Geological Survey Radiocarbon Dates XII

Radiocarbon ◽  
1977 ◽  
Vol 19 (2) ◽  
pp. 332-353 ◽  
Author(s):  
Elliott Spiker ◽  
Lea Kelley ◽  
Charles Oman ◽  
Meyer Rubin
Keyword(s):  
External Field ◽  
Half Life ◽  
Geological Survey ◽  
Radiocarbon Dates ◽  
Counting Error ◽  
Atmospheric Variations

This list contains the results of some measurements made between 1968 and 1974. Samples were counted in the form of acetylene gas, as previously, and ages were computed on the basis of the Libby half-life, 5568 ± 30 years. The error listed, always larger than the 1σ statistical counting error commonly used, takes into account variable laboratory factors but does not include external (field or atmospheric) variations or fractionation.

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.

scholarly journals US Geological Survey Radiocarbon Dates XIII

Radiocarbon ◽  
1978 ◽  
Vol 20 (1) ◽  
pp. 139-156 ◽  
Author(s):  
Elliott Spiker ◽  
Lea Kelley ◽  
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 1965 and 1973. 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 a δ13C 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 the variability experienced with replicate samples. We wish to thank Charles Oman for his technical assistance.

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 U. S. Geological Survey Radiocarbon Dates VI

Radiocarbon ◽  
1961 ◽  
Vol 3 ◽  
pp. 86-98 ◽  
Author(s):  
Meyer Rubin ◽  
Sarah M. Berthold
Keyword(s):  
Oxalic Acid ◽  
19Th Century ◽  
Half Life ◽  
Geological Survey ◽  
Radiocarbon Dates ◽  
Appreciable Difference ◽  
The 19Th Century ◽  
Modern Standard

Dates in this list have been determined at U. S. Geological Survey radiocarbon laboratory, Washington, since our 1960 date list (USGS V). Procedures for the preparation of acetylene gas used in the counting, and the method of counting, (two days in two separate counters) remain unchanged. However, the modern standard used is no longer wood grown in the 19th century, but 95% of the activity of NBS oxalic-acid radiocarbon standard, as recommended at the 1959 Groningen Radiocarbon Conference. Measurement of the oxalic-acid standard at our laboratory indicates 6.2 ± 1% more C14 activity than our modern wood standard; so use of the new standard should make no appreciable difference when comparing samples computed by the old method. W. F. Libby's (1955) half-life average for C14, 5568 ± 30 years, was used for the decay equation.

scholarly journals US Geological Survey, Denver, Colorado Radiocarbon Dates III

Radiocarbon ◽  
1981 ◽  
Vol 23 (1) ◽  
pp. 24-32 ◽  
Author(s):  
I C Yang ◽  
R L McAvoy ◽  
R L Emerson
Keyword(s):  
Half Life ◽  
Geological Survey ◽  
Total Alkalinity ◽  
Radiocarbon Dates ◽  
Statistical Errors ◽  
The Us ◽  
Age Limit

This list contains the results of measurements made during 1978 and 1979. Ages were computed on the radiocarbon half-life of 5568 ± 30 years. Statistical errors quoted herein are 1σ counting errors which include sample, background, and standard. The age limit reported is calculated on the basis of 3σ activity. The σ13C values in table 1 were measured by Krueger Enterprises, Inc, Geochron Laboratories Division1 and calculated based on Craig's Peedee Belemnite (PDB) limestone standard (Craig, 1957). The total alkalinity as bicarbonate values reported in table 1 was determined using techniques described by Brown, Skougstad, and Fishman (1970). Unless otherwise stated, all samples were collected and submitted by personnel of the US Geological Survey.

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