Hostname: page-component-586b7cd67f-g8jcs Total loading time: 0 Render date: 2024-11-29T19:43:44.432Z Has data issue: false hasContentIssue false
  • English
  • Français

Tallinn Radiocarbon Dates VII

Published online by Cambridge University Press:  18 July 2016

J M Punning ,
R Rajamäe ,
Kai Joers  and
H Putnik
J M Punning
Affiliation:
Institute of Geology, Academy of Sciences, Tallinn, ESSR
R Rajamäe
Affiliation:
Institute of Geology, Academy of Sciences, Tallinn, ESSR
Kai Joers
Affiliation:
Institute of Geology, Academy of Sciences, Tallinn, ESSR
H Putnik
Affiliation:
Institute of Geology, Academy of Sciences, Tallinn, ESSR
Rights & Permissions [Opens in a new window]

Extract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

This list comprises age measurements carried out at the Institute from 1979 to 1981. Anticoincidence variant was applied to attain higher counting efficiency of a 2-channel scintillation device. The introduction of a plastic scintillator as an active guard around the detector in the 2π geometry decreases the influence of high energy cosmic radiation and reduces the background ca 35 to 75% (Rajamäe & Punning, 1980). The application of an active guard with 4π geometry has proved most effective; as a result, the background decreased 85% to 0.65cpm with the volume of scintillation cocktail 5ml. We have improved our methods for decreasing the actual error of the background. The application of a control channel and consideration of barometric effect results in the increase of dating limits of up to 5000–6000 years (Rajamäe, 1981). Samples are calculated using a half-life of 5568 ± 30 years for 14C. Results are reported in years before 1950. δ13C measurements were performed on the mass-spectrometer MI-1201 and are reported with PDB as a reference standard. The reproducibility of results is ±0.2‰.

Type
Date Lists
Information
Radiocarbon , Volume 25 , Issue 3 , 1983 , pp. 908 - 918
Copyright
Copyright © The American Journal of Science 

References

Arslanov, H A, Voznyatchuk, L N, Velichkevitch, F Y, Machnatch, N A, Kalechich, E G, and Petrov, G S, 1971, The age of maximal stage of last glaciation between Zapadnaya Dvina and Dnepr Rivers: Trans Acad Sci USSR, v 196, no. 8, p 161–164.Google Scholar
Arslanov, H A, Velitchkevitch, F Y, Kondratiene, O P, and Krunke, M J, 1975, New data on geochronology and palaeogeography of Middle Valdai interstadial complex on the basis of Lejasciems section at Gauja R: Trans Acad Sci USSR, v 223, no. 6, p 1421–1424.Google Scholar
Grosswald, M G, 1972, Glacier variations and crustal movements in Northern European Russia in Late Pleistocene and Holocene times, in Acta Universitatis Ouluensis, ser A, Scientiae rerum naturalium. v 3, no. 1: Geologica, p 205–223.Google Scholar
Kondratiene, O P, 1965, Stratigraphical subdivision of Pleistocene deposits in SE Lithuania on the basis of palynologic data, in Stratigraphy of Quaternary deposits and palaeogeography of Anthropogene of SE Lithuania: Vilnius, p 189–261.Google Scholar
Martma, T A, Punning, J M K, and Putnik, H E, 1981, Isotope studies on lake lime section Tapa (E Estonia), in Isotope and geochemical methods in biology, geology and archaeology: Tartu, p 71–74.Google Scholar
Palu, V A, Paap, Ü A, Rajamäe, R A, and Veski, R E, 1981, On geochemical history of the development of Lahepera Lake (E Estonia), in Isotope and geochemical methods in biology, geology and archaeology: Tartu, p 94–97.Google Scholar
Punning, J M K, Putnik, H E, Pärnik, T R, Rajamäe, R A, Joers, K A, and Vaikmäe, R A, 1981, Fractionation of carbon isotopes by plants, in Isotope and geochemical methods in biology, geology and archaeology: Tartu, p 112–113.Google Scholar
Punning, J M, Rajamäe, R, and Hütt, G, 1982, On the age of alluvial deposits in Drichaluki and Brigitpole sections (N Byelorussia): Trans Acad Sci ESSR, v 31, Geol, no. 1, p 15–20.Google Scholar
Rajamäe, R A, 1981, On some possibilities of decreasing statistical error of the background of radiocarbon device, in Isotope and geochemical methods in biology, geology and archaeology: Tartu, p 114–117.Google Scholar
Rajamäe, R and Punning, J M, 1980, Some possibilities for development of C-14 measurements by liquid scintillation counting, in Stuiver, Minze and Kra, Renee, eds, Internatl radiocarbon conf, 10th, Proc: Radiocarbon, v 22, no. 2, p 435–441.Google Scholar
Vonsavichus, V and Baltrunas, V, 1974, The structure of Quaternary deposits near town Drusnininkai, in Problems of the study of Quaternary deposits in Lithuania: Vilnius, p 75–87.Google Scholar