scholarly journals University of Wisconsin Radiocarbon Dates VII

Radiocarbon ◽  
1970 ◽  
Vol 12 (1) ◽  
pp. 335-345 ◽  
Author(s):  
Margaret M. Bender ◽  
Reid A. Bryson ◽  
David A. Baerreis
Keyword(s):  
Standard Deviation ◽  
Half Life ◽  
Wood Charcoal ◽  
Radiocarbon Dates ◽  
University Of Wisconsin ◽  
Background Sample ◽  
Counting Statistics ◽  
Lake Cores

The radiocarbon dates obtained since August, 1968, are reported here. Wood, charcoal, and peat samples are pretreated with dilute NaOH and dilute H3PO4 before conversion to the methane used as counting gas; marls and lake cores are treated with acid only. The reported dates have been calculated using 5568 years as the half-life of C14, 1950 as the reference year. Samples are run at least once in each of two 0.5 liter counters at 3 atm pressure for a minimum total of 15,000 counts. The standard deviation quoted includes only the 1σ of the counting statistics of background, sample, and standard counts.

scholarly journals University of Wisconsin Radiocarbon Dates III

Radiocarbon ◽  
1967 ◽  
Vol 9 ◽  
pp. 530-544 ◽  
Author(s):  
Margaret M. Bender ◽  
Reid A. Bryson ◽  
David A. Baerreis
Keyword(s):  
Standard Deviation ◽  
Half Life ◽  
Radiocarbon Dates ◽  
University Of Wisconsin ◽  
Background Sample ◽  
Counting Statistics ◽  
The University

This report summarizes the radiocarbon dates obtained at the University of Wisconsin since November, 1965; the procedures followed and equipment used have been described previously (Wisconsin II).The dates reported have been calculated on the assumption of a half-life of 5568 yr for C14, 1950 as the reference year. Samples have normally been run at 3 atm pressure for a minimum of 15,000 counts. The standard deviation quoted includes only the 1σ of the counting statistics of background, sample, and standard counts.

scholarly journals University of Wisconsin Radiocarbon Dates V

Radiocarbon ◽  
1968 ◽  
Vol 10 (2) ◽  
pp. 473-478 ◽  
Author(s):  
Margaret M. Bender ◽  
Reid A. Bryson ◽  
David A. Baerreis
Keyword(s):  
Standard Deviation ◽  
Half Life ◽  
Radiocarbon Dates ◽  
University Of Wisconsin ◽  
Background Sample ◽  
Counting Statistics

The radiocarbon dates obtained since August, 1967 are included in this report. The procedures followed have been described previously (Wisconsin II).The reported dates have been calculated using 5568 as the half-life of C14, 1950 as the reference year. Samples are run at least once in each of two counters at 3 atm pressure for a minimum of 15,000 counts. The standard deviation quoted includes only the 1σ of the counting statistics of background, sample, and standard counts.

scholarly journals University of Wisconsin Radiocarbon Dates XIII

Radiocarbon ◽  
1976 ◽  
Vol 18 (1) ◽  
pp. 125-139 ◽  
Author(s):  
Margaret M Bender ◽  
Reid A Bryson ◽  
David A Baerreis
Keyword(s):  
Wood Charcoal ◽  
Radiocarbon Dates ◽  
University Of Wisconsin ◽  
Lake Cores

Procedures and equipment of the laboratory have been described in previous date lists. Lake cores and marls are treated with acid only, wood, charcoal, and peat samples with dilute NaOH and dilute H3PO4(unless indicated otherwise) before conversion to methane which is used as counting gas.

scholarly journals University of Wisconsin Radiocarbon Dates XXII

Radiocarbon ◽  
1985 ◽  
Vol 27 (2B) ◽  
pp. 455-469 ◽  
Author(s):  
Raymond L Steventon ◽  
John E Kutzbach
Keyword(s):  
Room Temperature ◽  
Wood Charcoal ◽  
Bone Sample ◽  
Radiocarbon Dates ◽  
University Of Wisconsin ◽  
The University ◽  
Lake Cores

Procedures and equipment used in the University of Wisconsin laboratory have been described in previous date lists (Steventon & Kutzbach 1983; 1984). Except as otherwise indicated, wood, charcoal, and peat samples are pretreated with dilute NaOH-Na4P2O7 and dilute H3PO4 before conversion to the counting gas methane; when noted, marls and lake cores are treated with acid only. Very calcareous materials are treated with HCl instead of H3PO4. Pretreatment of bone varies with the condition of the bone sample; solid bone with little deterioration is first cleaned manually and ultrasonically. The bone is treated with 8% HCl for 15 minutes, then dilute NaOH-Na4P2O7 for 3 hours at room temperature, washed until neutral, and the collagen extracted according to Longin (1971). Charred bone is treated with dilute HCl, NaOH-Na4P2O7, and then dilute HCl again.

scholarly journals University of Wisconsin Radiocarbon Dates XXVII

Radiocarbon ◽  
1992 ◽  
Vol 34 (1) ◽  
pp. 141-154
Author(s):  
Christine A. Prior ◽  
Lori F. Phelps
Keyword(s):  
Wood Charcoal ◽  
Radiocarbon Dates ◽  
University Of Wisconsin ◽  
The University ◽  
Lake Cores

Procedures and equipment used in the University of Wisconsin laboratory have been described previously (Bender, Bryson & Baerreis 1965; Steventon & Kutzbach 1986). Except as otherwise indicated, wood, charcoal and peat samples are pretreated with dilute NaOH-Na4P2O7 and dilute HCl before conversion to counting gas methane; when noted, marls and lake cores are treated with acid only.

scholarly journals Institute of Geological Sciences Radiocarbon Dates V

Radiocarbon ◽  
1974 ◽  
Vol 16 (1) ◽  
pp. 95-104 ◽  
Author(s):  
E Welin ◽  
L Engstrand ◽  
S Vaczy
Keyword(s):  
Standard Deviation ◽  
Half Life ◽  
Radiocarbon Dates ◽  
Counting Statistics ◽  
Geological Sciences

This date list was compiled by the Institute of Geological Sciences (UK) incorporating data supplied under contract by E Welin, Radioactive Dating Laboratory, Stockholm. Unless otherwise stated, age figures are in 14C years before ad 1950. The half-life of 14C is taken as 5568 years and the error, based on counting statistics of sample, background, and modern, is given as one standard deviation. Correction for 13C/12C fractionation has been made.

scholarly journals University of Wisconsin Radiocarbon Dates XVI

Radiocarbon ◽  
1979 ◽  
Vol 21 (1) ◽  
pp. 120-130 ◽  
Author(s):  
Margaret M Bender ◽  
David A Baerreis ◽  
Reid A Bryson
Keyword(s):  
Wood Charcoal ◽  
Radiocarbon Dates ◽  
University Of Wisconsin ◽  
Lake Cores

Procedures and equipment have been described in previous date lists. Except as otherwise indicated, wood, charcoal and peat samples are pretreated with dilute NaOH and dilute H3PO4 before conversion to the counting gas methane; marls and lake cores are treated with acid only. Very calcareous materials are treated with HCl instead of H3PO4.

scholarly journals University of Wisconsin Radiocarbon Dates XXVI

Radiocarbon ◽  
1990 ◽  
Vol 32 (2) ◽  
pp. 209-228 ◽  
Author(s):  
Raymond L Steventon ◽  
John E Kutzbach
Keyword(s):  
Wood Charcoal ◽  
Radiocarbon Dates ◽  
University Of Wisconsin ◽  
The University ◽  
Lake Cores

Procedures and equipment used in the University of Wisconsin laboratory have been described in previous date lists (Bender, Bryson & Baerreis 1965; Steventon & Kutzbach 1986). Except as otherwise indicated, wood, charcoal and peat samples are pretreated with dilute NaOH-NA4P2O7 and dilute H3PO4 before conversion to counting gas methane; when noted, marls and lake cores are treated with acid only. Very calcareous materials are treated with HCL instead of H3PO4.

scholarly journals University of Wisconsin Radiocarbon Dates XII

Radiocarbon ◽  
1975 ◽  
Vol 17 (1) ◽  
pp. 121-134 ◽  
Author(s):  
Margaret M Bender ◽  
Reid A Bryson ◽  
David A Baerreis
Keyword(s):  
Wood Charcoal ◽  
Radiocarbon Dates ◽  
University Of Wisconsin ◽  
Lake Cores

Procedures and equipment of the laboratory have been described in previous date lists. Wood, charcoal, and peat samples are pretreated with dilute NaOH and dilute H3PO4before conversion to the counting gas methane; marls and lake cores are treated with acid only. Very calcareous materials are treated with HCl instead of H3PO4.

scholarly journals University of Wisconsin Radiocarbon Dates XIV

Radiocarbon ◽  
1977 ◽  
Vol 19 (1) ◽  
pp. 127-137 ◽  
Author(s):  
Margaret M Bender ◽  
Reid A Bryson ◽  
David A Baerreis
Keyword(s):  
Wood Charcoal ◽  
Radiocarbon Dates ◽  
University Of Wisconsin ◽  
Lake Cores

Procedures and equipment of the laboratory have been described in previous date lists. Wood, charcoal, and peat samples are pretreated with dilute NaOH and dilute H3PO4 before conversion to the counting gas methane; marls and lake cores are treated with acid only. Very calcareous samples are treated with dilute HCl instead of H3PO4.

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