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 Rudjer Bošković Institute Radiocarbon Measurements X

Radiocarbon ◽  
1987 ◽  
Vol 29 (1) ◽  
pp. 135-147 ◽  
Author(s):  
Dušan Srdoč ◽  
Bogomil Obelić ◽  
Adela Sliepčević ◽  
Ines Krajcar Bronić ◽  
Nada Horvatinčić
Keyword(s):  
Oxalic Acid ◽  
Half Life ◽  
Sample Pretreatment ◽  
Radiocarbon Date ◽  
New Techniques ◽  
Counting Technique ◽  
Modern Standard

The following radiocarbon date list contains dates of samples measured since our previous list (R, 1984, v 26, no. 3, p 449–460). 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 NBS oxalic acid activity. Sample pretreatment, combustion and counting technique are essentially the same as described in R, 1971, v 13, no. 1, p 135–140, supplemented by new techniques for groundwater processing (R, 1979, v 21, no. 1, p 131–137).

scholarly journals Rudjer Bošković Institute Radiocarbon Measurements VIII

Radiocarbon ◽  
1984 ◽  
Vol 26 (3) ◽  
pp. 449-460 ◽  
Author(s):  
Dušan Srdoč ◽  
Bogomil Obelic ◽  
Nada Horvatinčic ◽  
Ines Krajcar ◽  
Adela Sliepčevic
Keyword(s):  
Oxalic Acid ◽  
Half Life ◽  
Sample Pretreatment ◽  
Radiocarbon Date ◽  
New Techniques ◽  
Counting Technique ◽  
Modern Standard

The following radiocarbon date list contains dates of samples measured since our previous list (R, 1982, v 24, p 352–371). 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 NBS oxalic acid activity. 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).

scholarly journals Rudjer Bošković Institute Radiocarbon Measurements IX

Radiocarbon ◽  
1987 ◽  
Vol 29 (1) ◽  
pp. 115-134 ◽  
Author(s):  
Dušan Srdoč ◽  
Nada Horvatinčić ◽  
Bogomil Obelić ◽  
Ines Krajcar Bronić ◽  
Adela Sliepčević
Keyword(s):  
Oxalic Acid ◽  
Lake Sediments ◽  
Half Life ◽  
Counting Rate ◽  
Statistical Processing ◽  
Sample Pretreatment ◽  
Initial Activity ◽  
New Techniques ◽  
Plitvice Lakes ◽  
Modern Standard

The following radiocarbon date list contains dates of samples from Plitvice Lakes measured since our previous list dealing with tufa from this region (Srdoč et al, 1982). Tufa measurements from the Knin area in S Croatia and some localities in Bosnia are also listed. Age calculations are based on the Libby half-life (5570 ± 30) yr and reported in years before 1950. Reported ages are based on the initial activity of 85% except for lake sediments where calculations of initial activity have been performed. The modern standard is 0.95 of the NBS oxalic acid activity. Sample pretreatment 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). Statistical processing of data has been computerized (Obelić & Planinić, 1977; Obelić, 1980). The errors quoted correspond to 1 σ variation of sample net counting rate and do not include the uncertainty in 14C half-life.

scholarly journals Nancy Natural Radiocarbon Measurements II

Radiocarbon ◽  
1969 ◽  
Vol 11 (2) ◽  
pp. 463-468 ◽  
Author(s):  
B. Hassko ◽  
B. Guillet ◽  
R. Coppens
Keyword(s):  
Oxalic Acid ◽  
Proportional Counter ◽  
Half Life ◽  
Counting Technique ◽  
Dating Method ◽  
Made In ◽  
Modern Standard

The following list includes a selected number of measurements made during 1967-1968 in the Natural Radiocarbon Laboratory of the Centre de Recherches Radiogéologiques de Nancy. This list is a continuation of Nancy Natural Radiocarbon Measurements I (Radiocarbon, 1968, v. 10, p. 119-123). The dating method, counting technique, and equipment are described in that list. All measurements were made in a proportional counter with a capacity of 1.16 L, normally filled with CO2 under a pressure of 736 mm Hg. Ages are calculated using a C14 half-life of 5568 yrs with 1950 as reference yr. Modern standard used following samples Ny-118 is 95% of NBS oxalic acid activity. The SC14 mentioned later in the date list are calculated according to Broecker and Olson (1959).

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 Tallinn Radiocarbon Dates VI

Radiocarbon ◽  
1980 ◽  
Vol 22 (1) ◽  
pp. 91-98 ◽  
Author(s):  
J M Punning ◽  
R Rajamäe ◽  
K Joers ◽  
H Putnik
Keyword(s):  
Oxalic Acid ◽  
Half Life ◽  
Radiocarbon Dates ◽  
Academy Of Sciences ◽  
Modern Standard

The following list includes samples dated at the Institute of Geology, Academy of Sciences of the Estonian SSR in 1978. The measurement of natural 14C activity is performed by 1-channel and 2-channel scintillation devices (Punning & Rajamäe, 1977). Ages are calculated using the half-life of 5568 ± 30 years and 0.95 NBS oxalic acid modern standard with ad 1950 as 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 Tartu Radiocarbon Dates XIII

Radiocarbon ◽  
1994 ◽  
Vol 36 (1) ◽  
pp. 153-158
Author(s):  
Arvi Liiva ◽  
Ilze Loze
Keyword(s):  
Standard Deviation ◽  
Oxalic Acid ◽  
Liquid Scintillation Counting ◽  
Half Life ◽  
Liquid Scintillation ◽  
Standard Sample ◽  
Scintillation Counting ◽  
Radiocarbon Dates ◽  
Academy Of Sciences ◽  
Modern Standard

This date list reports dates of archaeological samples of Mesolithic and Neolithic sites of Estonia, Latvia and Lithuania. We use liquid scintillation counting at the Geochemical and Statistical Laboratory of the Institute of Zoology and Botany, Estonian Academy of Sciences. Our modern standard is benzene enriched in 14C and its activity is checked with an NBS oxalic acid standard sample. Dates are given in conventional 14C years, based on the Libby half-life of 5570 ± 30 yr. AD 1950 is the reference year. Errors are based on one standard deviation calculated from count rates.

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 Riken Natural Radiocarbon Measurements IV

Radiocarbon ◽  
1968 ◽  
Vol 10 (2) ◽  
pp. 333-345 ◽  
Author(s):  
Fumio Yamasaki ◽  
Tatsuji Hamada ◽  
Chikako Fujiyama
Keyword(s):  
Stainless Steel ◽  
Oxalic Acid ◽  
Fresh Water ◽  
Half Life ◽  
Water Shell ◽  
Calcareous Deposits ◽  
Modern Standard

The C14 dates given below are a continuation of the work presented in our previous list (RIKEN III), and have been obtained by counting CO2 at ca. 2 atm pressure in a 2.7 L stainless steel counter. Results obtained mainly during 1967 are described.Shell samples were treated with 1% HCl to remove the outer 10%. Calcareous deposits on the surface, when observed, were removed by mechanical means.Dates were calculated on the basis of the C14 half-life of 5568 yr and 95% NBS oxalic acid as modern standard. No correction was applied even for fresh water shell samples.

Sign in / Sign up

Export Citation Format

Share Document