Primary standardisation of technetium-99m by liquid scintillation coincidence counting

van Wyngaardt, WM; Tobin, SM; Lee, S; Smith, ML; Jackson, TW; Ilter, J; Howe, B; Sarbutt, A

Primary standardisation of technetium-99m by liquid scintillation coincidence counting

Date

2020-02

Authors

Publisher

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

Keywords

Technetium 99, Liquid scintillators, Scintillation counting, Diagnostic techniques, OPAL Reactor, Measuring instruments, Electrons

Citation

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