scholarly journals University of Michigan Radiocarbon Dates VII

Radiocarbon ◽  
1962 ◽  
Vol 4 ◽  
pp. 183-203 ◽  
Author(s):  
H. R. Crane ◽  
James B. Griffin
Keyword(s):  
Full Description ◽  
University Of Michigan ◽  
Radiocarbon Dates ◽  
Counting Technique ◽  
Method Of Measurement

The following is a list of C14dates obtained since the preparation of the manuscript for publication of Michigan Radiocarbon Dates VI in December 1960. The method of measurement and treatment of data are the same as described in the introduction to Michigan lists III and IV. Since the time of publication of list VI, a full description of the counting technique and equipment has been published (Crane, 1961a, b).

scholarly journals University of Michigan Radiocarbon Dates IV

Radiocarbon ◽  
1959 ◽  
Vol 1 ◽  
pp. 173-198 ◽  
Author(s):  
H. R. Crane ◽  
James B. Griffin
Keyword(s):  
Isotope Fractionation ◽  
University Of Michigan ◽  
Reference Standard ◽  
Radiocarbon Dates ◽  
Carbonate Sample ◽  
Method Of Measurement

The following is a list of radiocarbon dates obtained since the time of the preparation of Michigan list III.∗ The description of the essential features of our method of measurement as given in the introduction to list III applies to this list. The modern standards used were obtained from hardwood logs, and were of various ages from 75 to 150 years by ring count. These standards were sufficiently old so that no correction for the recent dilution of the atmospheric C14is believed to be necessary in the dates reported here. The ages of carbonate sample are also calculated from modern wood as a reference standard, without any correction for isotope fractionation.

scholarly journals University of Michigan Radiocarbon Dates VIII

Radiocarbon ◽  
1963 ◽  
Vol 5 ◽  
pp. 228-253 ◽  
Author(s):  
H. R. Crane ◽  
James B. Griffin
Keyword(s):  
Standard Deviation ◽  
Half Life ◽  
Radiocarbon Dating ◽  
Geiger Counter ◽  
University Of Michigan ◽  
Radiocarbon Dates ◽  
Statistical Errors ◽  
Counting Technique ◽  
Life Scale ◽  
The Many

The following is a list of dates obtained since the time of the compilation of List VII in December 1961. The method is essentially the same as that used for the work described in the previous list. Two CO2-CS2 Geiger counter systems are used. The equipment and counting technique have been described elsewhere (Crane, 1961a, 1961b). The dates and the estimates of error in this list follow the practice recommended by the International Radiocarbon Dating Conference of 1962, in that (a) dates are computed on the basis of a half life of 5568 years, (b) a.d. 1950 is used as the zero of the age scale and (c) the errors quoted are the standard deviations obtained from the numbers of counts only. In all previous Michigan date lists we have quoted errors at least twice as great as the statistical errors of counting, in order to take account of other errors in the over-all process. If the reader wishes to obtain a standard deviation figure which will allow ample room for the many other sources of error in the dating process, we suggest he double the figures that are given in this list. The procedures for converting the dates to the more recent half life scale and to a scale having its zero at any time other than 1950 need not be given here as they have been covered in this journal and elsewhere. Where there is no comment, it is because the submitter of the sample had none to make.

scholarly journals University of Michigan Radiocarbon Dates V

1960 ◽  
Vol 2 ◽  
pp. 31-48 ◽  
Author(s):  
H. R. Crane ◽  
James B. Griffin
Keyword(s):  
University Of Michigan ◽  
Radiocarbon Dates ◽  
Method Of Measurement

The following is a list of radiocarbon dates obtained since the time of the preparation of Michigan list IV. The method of measurement and treatment of data are the same as those described in the introductions to lists III and IV.

scholarly journals University of Michigan Radiocarbon Dates VI

Radiocarbon ◽  
1961 ◽  
Vol 3 ◽  
pp. 105-125 ◽  
Author(s):  
H. R. Crane ◽  
James B. Griffin
Keyword(s):  
University Of Michigan ◽  
Radiocarbon Dates ◽  
Method Of Measurement

The following is a list of radiocarbon dates obtained since the preparation of the manuscript for the publication of Michigan V, in December, 1959. The method of measurement and treatment of data are the same as those described in the introductions to Michigan lists III and IV. A full statement on the Michigan counter is referred to by Crane (p. 46) in this issue.

University of Michigan Radiocarbon Dates III

Science ◽  
1958 ◽  
Vol 128 (3332) ◽  
pp. 1117-1123 ◽  
Author(s):  
H. R Crane ◽  
J. B. Griffin
Keyword(s):  
University Of Michigan ◽  
Radiocarbon Dates

scholarly journals University of Michigan Radiocarbon Dates XV

Radiocarbon ◽  
1972 ◽  
Vol 14 (1) ◽  
pp. 195-222 ◽  
Author(s):  
H. R. Crane ◽  
James B. Griffin
Keyword(s):  
Half Life ◽  
Radiocarbon Dating ◽  
Geiger Counter ◽  
University Of Michigan ◽  
Radiocarbon Dates ◽  
Statistical Errors ◽  
Standard Deviations

The following is a list of dates obtained since the compilation of List XIV, and the method is essentially the same. Two CO2–CS2 Geiger counter systems were used. Equipment and counting techniques have been described elsewhere (Crane, 1961). Dates and estimates of error in this list follow the practice recommended by the International Radiocarbon Dating Conference of 1962 and 1965, in that (a) dates are computed on the basis of the Libby half-life, 5570 yr, (b) A.D. 1950 is used as the zero of the age scale, and (c) the errors quoted are the standard deviations obtained from the number of counts only. In Michigan date lists up to and including VII, we quoted errors at least twice as great as the statistical errors of counting, to take account of other errors in the over-all process.

scholarly journals University of Michigan Radiocarbon Dates XI

Radiocarbon ◽  
1966 ◽  
Vol 8 ◽  
pp. 256-285 ◽  
Author(s):  
H. R. Crane ◽  
James B. Griffin
Keyword(s):  
Standard Deviation ◽  
Half Life ◽  
Radiocarbon Dating ◽  
Geiger Counter ◽  
University Of Michigan ◽  
Radiocarbon Dates ◽  
Statistical Errors ◽  
Sources Of Error ◽  
The Many ◽  
Many Sources

The following is a list of dates obtained since the time of the compilation of List X in December 1964. The method is essentially the same as that used for the work described in the previous list. Two CO2-CS2Geiger counter systems are used. The equipment and counting techniques have been described elsewhere (Crane, 1961). The dates and estimates of error in this list follow the practice recommended by the International Radiocarbon Dating Conferences of 1962 and 1965, in that (a) dates are computed on the basis of the Libby half-life, 5570 yr, (b) A.D. 1950 is used as the zero of the age scale, and (c) the errors quoted are the standard deviations obtained from the numbers of counts only. In previous Michigan date lists up to and including VII we have quoted errors at least twice as great as the statistical errors of counting, in order to take account of other errors in the over-all process. If the reader wishes to obtain a standard deviation figure which will allow ample room for the many sources of error in the dating process, we suggest he double the figures that are given in this list.

scholarly journals University of Michigan Radiocarbon Dates IX

Radiocarbon ◽  
1964 ◽  
Vol 6 ◽  
pp. 1-24 ◽  
Author(s):  
H. R. Crane ◽  
James B. Griffin
Keyword(s):  
Standard Deviation ◽  
Half Life ◽  
Radiocarbon Dating ◽  
Geiger Counter ◽  
University Of Michigan ◽  
Radiocarbon Dates ◽  
Statistical Errors ◽  
Sources Of Error ◽  
Standard Deviations ◽  
The Many

The following is a list of dates obtained since the time of the compilation of List VIII in December 1962. The method is essentially the same as that used for the work described in the previous list. Two CO2-CS2 Geiger counter systems are used. The equipment and counting techniques have been described elsewhere (Crane, 1961a, 1961b). The dates and the estimates of error in this list follow the practice recommended by the International Radiocarbon Dating Conference of 1962, in that (a) dates are computed on the basis of the Libby half life, 5570 years, (b) a.d. 1950 is used as the zero of the age scale and (c) the errors quoted are the standard deviations obtained from the numbers of counts only. In previous Michigan date lists up to and including VII we have quoted errors at least twice as great as the statistical errors of counting, in order to take account of other errors in the over-all process. If the reader wishes to obtain a standard deviation figure which will allow ample room for the many other sources of error in the dating process, we suggest he double the figures that are given in this list. Where there is no comment, it is because the submitter of the sample had none to make.We wish to acknowledge the help of Patricia Dahlstrom in preparing chemical samples and Roscoe Wilmeth in preparing the descriptions. The descriptions and comments are essentially those of persons submitting the samples.

University of Michigan Radiocarbon Dates I

Science ◽  
1956 ◽  
Vol 124 (3224) ◽  
pp. 664-672 ◽  
Author(s):  
H. R. Crane
Keyword(s):  
University Of Michigan ◽  
Radiocarbon Dates

scholarly journals University of Michigan Radiocarbon Dates XIV

Radiocarbon ◽  
1972 ◽  
Vol 14 (1) ◽  
pp. 155-194 ◽  
Author(s):  
H. R. Crane ◽  
James B. Griffin
Keyword(s):  
Half Life ◽  
Radiocarbon Dating ◽  
Geiger Counter ◽  
University Of Michigan ◽  
Radiocarbon Dates ◽  
Statistical Errors ◽  
Standard Deviations

The following is a list of dates obtained since the compilation of List XIII (R., 1970, v. 12, p. 161–180). The method is essentially the same. Two CO2–CS2Geiger counter systems were used. Equipment and counting techniques have been described elsewhere (Crane, 1961). Dates and estimates of error in this list follow the practice recommended by the International Radiocarbon Dating Conferences of 1962 and 1965, in that (a) dates are computed on the basis of the Libby half-life, 5570 yr; (b) A.D. 1950 is used as the zero of the age scale; and (c) the errors quoted are the standard deviations obtained from the number of counts only. In Michigan date lists up to and including VII, we quoted errors at least twice as great as the statistical errors of counting in order to take into account other errors in the over-all process.

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