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Tallinn Radiocarbon Dates IV

Published online by Cambridge University Press:  18 July 2016

J M Punning ,
R Rajamäe ,
M Ehrenpreis  and
L Sarv
J M Punning
Affiliation:
Institute of Geology, Academy of Sciences, Estonian SSR
R Rajamäe
Affiliation:
Institute of Geology, Academy of Sciences, Estonian SSR
M Ehrenpreis
Affiliation:
Institute of Geology, Academy of Sciences, Estonian SSR
L Sarv
Affiliation:
Institute of Geology, Academy of Sciences, Estonian SSR
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The following list includes samples dated in 1975. The measurement of 14C activity was performed with 1-channel and 2-channel scintillation devices. Special attention was paid to the decrease of the background. The effectiveness of the measurement is ca 50% (Punning, Rajamäe, 1975). The “enriched standard” (Alekseejev et al, 1971) has been used as a contemporary reference standard of modern carbon. Age calculations are based on the 14C half-life of 5568 ± 30 yr, with 1950 as the standard year of reference. All samples are calculated to ± 1σ with respect to sample, standard and background after counting times of at least 2800 minutes. 13C/12C measurements and corrections have not been made for these samples.

Type
Research Article
Information
Radiocarbon , Volume 19 , Issue 1 , 1977 , pp. 111 - 117
Copyright
Copyright © The American Journal of Science 

References

Alekseejev, V A, Vinogradova, S N, Galimov, E M, Lavrukhina, A K, Sulerzhidski, L D, and Forova, V S, 1971, Carbon isotopes in the rings of sequoia: All-Union conf on variations of radiocarbon content in the Earth‘s atmosphere and radiocarbon dating, Vilnius (in Russian).Google Scholar
Lavrushin, Yu A, 1969, Quaternary deposits of Spitzbergen: Moscow, Nauka (in Russian).Google Scholar
Troitski, L N, 1967, Glaciogeomorphological studies on Spitzbergen: Glaciological studies, v 13, p 108–124 (in Russian).Google Scholar
Punning, J M and Rajamae, R, 1975, Some ways of background lowering in a liquid scintillation beta-spectrometer: Internatl conf in low radioactivity measurement and applications, abs, p 18–19.Google Scholar
Semevski, D V and Shkatov, E P, 1965, Contemporary regression of glaciers on Spitzbergen: Leningrad, p 179–191 (in Russian).Google Scholar