scholarly journals Tata Institute Radiocarbon Date List III

Radiocarbon ◽  
1965 ◽  
Vol 7 ◽  
pp. 291-295 ◽  
Author(s):  
D. P. Agrawal ◽  
S. Kusumgar ◽  
D. Lal
Keyword(s):  
Proportional Counter ◽  
Half Life ◽  
Radiocarbon Date ◽  
Historic Sites ◽  
Tata Institute ◽  
Gas Proportional Counter ◽  
Early Historic

In this paper are reported C14 dates of archaeologic samples from the Neolithic, Harappan and Early Historic sites of India. C14 activity was counted in an Oeschger-Houtermans’ gas proportional counter. The counting gas, acetylene, was synthesized using the technique described earlier (Kusumgar and others, 1963). The dates presented here are based on 5568 yr for the half-life of C14. The conversion to A.D./B.C. scale has been made using a.d. 1950 as the reference year.

scholarly journals Tata Institute Radiocarbon Date List II

Radiocarbon ◽  
1964 ◽  
Vol 6 ◽  
pp. 226-232 ◽  
Author(s):  
D. P. Agrawal ◽  
S. Kusumgar ◽  
D. Lal ◽  
R. P. Sarna
Keyword(s):  
Oxalic Acid ◽  
Proportional Counter ◽  
Half Life ◽  
Radiocarbon Date ◽  
Naoh Pretreatment ◽  
Tata Institute ◽  
Gas Proportional Counter ◽  
Inorganic Fraction

The C14 dates presented here have been obtained by counting acetylene, synthesised from the sample, in an Oeschger-Houtermans’ gas proportional counter. The chemical and counting procedures have been described in some detail (Kusumgar et al., 1963a).Dates are based on the C14 half-life value of 5568 yr. For conversion of b.p. dates to a.d./b.c. scale, a.d. 1950 has been taken as the reference yr. Ninety-five % activity of NBS oxalic acid has been adopted as the value for the pre-1900 age-corrected wood.All samples were treated with dilute HCl. Whenever NaOH pretreatment was possible, it has been mentioned in the date list. In the case of bones, only the inorganic fraction has been dated.

scholarly journals High-precision half-life determination for Na21 using a 4π gas-proportional counter

2017 ◽  
Vol 96 (2) ◽  
Author(s):  
P. Finlay ◽  
A. T. Laffoley ◽  
G. C. Ball ◽  
P. C. Bender ◽  
M. R. Dunlop ◽  
...  
Keyword(s):  
High Precision ◽  
Proportional Counter ◽  
Half Life ◽  
Gas Proportional Counter

scholarly journals Tata Institute Radiocarbon Date List VII

Radiocarbon ◽  
1969 ◽  
Vol 11 (2) ◽  
pp. 502-508 ◽  
Author(s):  
D. P. Agrawal ◽  
S. K. Gupta ◽  
Sheela Kusumgar
Keyword(s):  
Oxalic Acid ◽  
Half Life ◽  
Counting Rate ◽  
Radiocarbon Date ◽  
Reference Standard ◽  
A Value ◽  
Tata Institute

We continue to give dates based on the half-life of 5568 years according to the decision of the Sixth Pullman Conference (Internatl. Conf., Pullman, 1965). The year 1950 has been used as a reference year for converting the dates to A.D./B.C. scale. A value corresponding to 95% net counting rate of the NBS oxalic acid has been used as the modern reference standard.

scholarly journals Rudjer Bošković Institute Radiocarbon Measurements VI

Radiocarbon ◽  
1981 ◽  
Vol 23 (3) ◽  
pp. 410-421 ◽  
Author(s):  
Dušan Srdoč ◽  
Adela Sliepčevic ◽  
Bogomil Obelic ◽  
Nada Horvatinčic
Keyword(s):  
Oxalic Acid ◽  
Soil Sample ◽  
Half Life ◽  
Sample Pretreatment ◽  
Radiocarbon Date ◽  
Sample Treatment ◽  
New Techniques ◽  
Counting Technique ◽  
Acid Sample ◽  
Modern Standard

The following radiocarbon date list contains dates of samples measured since our previous list (R, 1979, v 21, p 131-137). As before, age calculations are based on the Libby half-life 5570 ± 30 yr and reported in years before 1950. The modern standard is 0.95 of the activity of NBS oxalic acid. Sample pretreatment, combustion, and counting technique are essentially the same as described in R, 1971, v 13, p 135-140, supplemented by new techniques for groundwater processing (R, 1979, v 21, p 131-137) and for soil sample treatment (R, 1977, v 19, p 465-475).

scholarly journals Physical Research Laboratory Radiocarbon Date List VI

Radiocarbon ◽  
1991 ◽  
Vol 33 (3) ◽  
pp. 329-344 ◽  
Author(s):  
D. P. Agrawal ◽  
Sheela Kusumgar ◽  
M. G. Yadava
Keyword(s):  
Standard Deviation ◽  
Oxalic Acid ◽  
Proportional Counter ◽  
Research Laboratory ◽  
Radiocarbon Date ◽  
Geological Samples ◽  
Physical Research Laboratory ◽  
Detailed Procedure ◽  
Counting Statistics ◽  
Modern Standard

We present here dates for archaeological and geological samples. The dates are based on τ1/2 = 5568 years, using 1950 as the base year. The modern standard was 95% of activity of NBS oxalic acid.Samples were pretreated, prepared by methane synthesis and counted in a proportional counter. The detailed procedure has been described earlier (Agrawal, Gupta & Kusumgar 1971). We reported minor changes in previous date lists. Quoted errors are based on counting statistics alone. For samples younger than 10,000 years, the error is 1 standard deviation, and for older samples, 2 standard deviations. The dates are not corrected for 13C fractionation. Samples have been arranged alphabetically according to the name of the site.

scholarly journals Vienna Radium Institute Radiocarbon Dates IX

Radiocarbon ◽  
1979 ◽  
Vol 21 (2) ◽  
pp. 298-305
Author(s):  
Heinz Felber
Keyword(s):  
Proportional Counter ◽  
Half Life ◽  
Standard Sample ◽  
Radium Institute ◽  
Radiocarbon Dates ◽  
Standard Deviations ◽  
Single Standard ◽  
Background Counting

Measurements have continued with the same proportional counter system, pretreatment procdure, methane preparation, measurement, and calculation, as described previously (R, 1970, v 12, p 298-318). Uncertainties quoted are single standard deviations originating from standard, sample, background counting rates and half-life. No 13C/12C ratios were measured.

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