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A Multi-Counter System for High Precision Carbon-14 Measurements

Published online by Cambridge University Press:  18 July 2016

Hildegard Schoch ,
Michael Bruns ,
Karl Otto Münnich  and
Marianne Münnich
Hildegard Schoch
Affiliation:
Institut für Umweltphysik der Universität Heidelberg, Heidelberg, West Germany
Michael Bruns
Affiliation:
Institut für Umweltphysik der Universität Heidelberg, Heidelberg, West Germany
Karl Otto Münnich
Affiliation:
Institut für Umweltphysik der Universität Heidelberg, Heidelberg, West Germany
Marianne Münnich
Affiliation:
Institut für Umweltphysik der Universität Heidelberg, Heidelberg, West Germany
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Abstract

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A new 14C detector system containing nine, independently working, CO2 proportional counters is described. The system is designed for a sufficient measuring capacity at a precision level better than σ = ± 2‰, which requires a counting time of about one week per sample. The size of the installation requires a simple and economic design of counters and electronics. A single anticoincidence shield for all counters consists of five newly developed flat counters. The modern counting rate (52cpm) is sensitively checked by running Heidelberg sodium carbonate standard samples wth a counting rate of about 10 times modern. A microcomputer (DEC PDP-11 /03) is used for data acquisition. Recent developments in laboratory techniques (preparation and gaschromatographic purification of samples) are also reported.

Type
Techniques
Information
Radiocarbon , Volume 22 , Issue 2 , 1980 , pp. 442 - 447
Copyright
Copyright © The American Journal of Science 

References

Bruns, Michael, 1976, Gaschromatographie mit Rn-222: MS thesis, Univ Heidelberg.Google Scholar
Bruns, Michael, Münnich, K O, and Becker, Bernd, 1980, Natural radiocarbon variations from ad 200 to 800, in Stuiver, Minze and Kra, Renee, eds, Internatl radiocarbon conf, 10th, Proc: Radiocarbon, v 22, no. 2, p 273–277.Google Scholar
Roether, Wolfgang, Münnich, K O, and Schoch, Hildegard, 1980, On the 14C to tritium relationship in the North Atlantic Ocean, in Stuiver, Minze and Kra, Renee, eds, Internatl radiocarbon conf, 10th, Proc: Radiocarbon, v 22, no. 3, p 636–646.Google Scholar