van Rooy MW, van Staden MJ, Simpson BRS, Lubbe J. Activity determination of
18F using liquid scintillation beta-efficiency extrapolation and non-extrapolation methods.
Appl Radiat Isot 2020;
160:109070. [PMID:
32351212 DOI:
10.1016/j.apradiso.2020.109070]
[Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2019] [Revised: 12/06/2019] [Accepted: 01/31/2020] [Indexed: 11/29/2022]
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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