Primary standardisation of technetium-99m by liquid scintillation coincidence counting
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Elsevier B. V.
Abstract
Technetium-99m was standardised by the 4π(LS)ce-γ coincidence extrapolation method. Sensitivity of the 4π(LS) channel to two types of radiation, namely conversion electrons and γ-rays, resulted in incorrect activity values being obtained when this was not adequately accounted for. Measurements were more robust when the LS detection efficiency was optimised, and when a γ-window setting was used that monitored the combined LS efficiency for conversion electrons and γ-rays. The primary standard was internationally compared through participation in the BIPM.RI(II)-K4.Tc99m key comparison. © 2019 Elsevier Ltd
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van Wyngaardt, W. M., Tobin, S. M., Lee, S., Smith, M. L., Jackson, T. W., Ilter, J., Howe, B. & Sarbutt, A. (2020). Primary standardisation of technetium-99m by liquid scintillation coincidence counting. Applied Radiation and Isotopes, 156, 108935. doi:10.1016/j.apradiso.2019.108935