Liquid Scintillation and Geiger Counting Efficiencies for Carbon-14 Incorporated by Marine Phytoplankton in Productivity Measurements
- 1 April 1967
- journal article
- Published by Oxford University Press (OUP) in ICES Journal of Marine Science
- Vol. 31 (1) , 31-37
- https://doi.org/10.1093/icesjms/31.1.31
Abstract
C14-labelled phytoplankton on filter papers were counted with a gas-flow geigercounter, then combusted in oxygen combustion flasks. C14O2 was recovered with hyamine, andthe absolute activities of the original samples weredetermined by liquid scintillation counting. Geiger counting efficiency, based on the absolute activities, was 25·8% ± 1·19. Intact filter papers containing C14-phytoplankton also were counted directly by liquid scintillation. Comparison of liquid scintillation and geiger activities for the same samples showed that the absolute activity of C14-phytoplankton on filter paper can be determined by direct liquid scintillation counting of the intact sample.Keywords
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