Radiant energy – Methods including separation or nonradiant treatment of test...
Reexamination Certificate
2007-11-06
2007-11-06
Wells, Nikita (Department: 2881)
Radiant energy
Methods including separation or nonradiant treatment of test...
C436S059000, C422S083000
Reexamination Certificate
active
10924672
ABSTRACT:
The invention provides a method and apparatus for preparing samples of carbon dioxide with a14C content for analysis in liquid scintillation counting equipment, the sample being of a known mass and being introduced into and substantially wholly absorbed into an absorption “cocktail”, absorption being completed at a stage before saturation of the absorbent occurs. The absorbent is contained in a vial which, when absorption has been completed, is transferred into the scintillation counting equipment without intermediate transfer of the contents.
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Thomson,J. Sample Preparation and Counting of Biological Samples, Packard Instrument Application Note AN9002-CSR, 1999.
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Leaney, et al., New Developments For The Direct CO, Absorption Method For Radiocarbon Analysis, Quarternary Geochronology/Quarternary Science Review, 1994, pp. 171-178, vol. 13, Elsevier Science Ltd., Great Britain.
Qureshi et al., The CO2absorption method as an alternative to benzene synthesis method for14C dating, Applied Geochemistry, 1989, pp. 625-633, vol. 4, Pergamons Press, Great Britain.
Aravena et al., New Possibilities for14C Measurements By Liquid Counting, Radiocarbon, 1989, pp. 387-392, vol. 31, No. 3, Geological Survey of Canada, Canada.
Fulwider Patton LLP
Johnston Phillip
Wells Nikita
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