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 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 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 High precision half-life measurement of 125Cs and 125Xe with γ-spectroscopy

2019 ◽  
Vol 986 ◽  
pp. 213-222 ◽  
Author(s):  
T.N. Szegedi ◽  
G.G. Kiss ◽  
I. Öksüz ◽  
T. Szücs ◽  
Gy. Gyürky ◽  
...  
Keyword(s):  
High Precision ◽  
Half Life ◽  
Life Measurement

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.

scholarly journals Vienna Radium Institute Radiocarbon Dates II

Radiocarbon ◽  
1971 ◽  
Vol 13 (1) ◽  
pp. 126-134 ◽  
Author(s):  
Heinz Felber
Keyword(s):  
Proportional Counter ◽  
Half Life ◽  
Sample Pretreatment ◽  
Radium Institute ◽  
Radiocarbon Dates

Measurements have continued with the same proportional counter system, the same procedure in sample pretreatment, methane preparation and measurement, and the same age calculation using a half-life of 5568 ± 30 yr as described previously (R., 1970, v. 12, p. 298–318).

scholarly journals Stockholm Natural Radiocarbon Measurements IV

Radiocarbon ◽  
1962 ◽  
Vol 4 ◽  
pp. 115-136 ◽  
Author(s):  
Lars G. Engstrand ◽  
H. Göte Östlund
Keyword(s):  
Oxalic Acid ◽  
Proportional Counter ◽  
Half Life ◽  
The Third ◽  
Direct Continuation

This paper is a direct continuation of the third dating list (Stockholm III), and the entire technique is virtually unchanged, using one 0.5–1 and one 1.0.1 3 atm CO2proportional counter. Ages are calculated according to the recommendation given in the introduction of this book, and δC13has been measured for unknown samples and for the different CO2preparations of the NBS oxalic-acid standard. Since the numerical relationship between the C14activity of our old oak standard and that of NBS was valid for a δC13value of almost exactly −19 for the NBS preparation in question, it still holds true that all dates given in Stockholm I, II and III can be converted to the new scale by subtracting 55 yr. The NBS preparation St-532 measured by Craig (1961) having a δC13value of −17.2 is only one of several preparations with values between −17 and −20. Age figures are given in C14yr before A.D. 1950; the half life for C14is taken as 5568 ± 30 yr.

scholarly journals Vienna Radium Institute Radiocarbon Dates XI

Radiocarbon ◽  
1981 ◽  
Vol 23 (2) ◽  
pp. 322-326
Author(s):  
Heinz Felber
Keyword(s):  
Proportional Counter ◽  
Half Life ◽  
Standard Sample ◽  
Radium Institute ◽  
Radiocarbon Dates ◽  
Measured Sample ◽  
Standard Deviations ◽  
Single Standard ◽  
Background Counting

Measurements have continued with the same proportional counter system, pretreatment procedure, methane preparation and 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. Sample descriptions have been prepared in cooperation with submitters.

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