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Activity determination of 18F using liquid scintillation beta-efficiency extrapolation and non-extrapolation methods
M W van Rooy1, M J van Staden1, B R S Simpson1
1Radioactivity Standards Section, NMISA, 15 Lower Hope Road, Rosebank, 7700, Cape Town, South Africa.
Abstract:
The absolute activity of 18F was determined using 4πβ-γ liquid scintillation coincidence counting using beta-efficiency extrapolation. An ionization chamber factor was determined for use during a SIRTI comparison, for which results are presented. A non-extrapolation method based on a detection efficiency analysis was also employed using an adaptation of the double-phototube coincidence efficiency for a threshold above the second monopeak. Results and uncertainty budgets for the two methods are presented and discussed.
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