Browsing by Author "Tobin, SM"

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    Development of the Australian standard for germanium-68 by two liquid scintillation counting methods
    (Elsevier B. V., 2018-04) van Wyngaardt, WM; Smith, ML; Jackson, TW; Howe, B; Tobin, SM; Reinhard, MI
    In response to the increasing application of 68Ge/68Ga and 68Ga in nuclear medicine, an international comparison of activity measurement of 68Ge in equilibrium with 68Ga was organised. ANSTO standardised the comparison solution by the 4π(LS)β+-γ coincidence extrapolation and TDCR efficiency calculation methods, with excellent agreement between the two results. The primary standard was transferred to the ANSTO Secondary Standard Ionisation Chamber. Internationally traceable Australian Certified Reference Materials (ACRMs) of 68Ge/68Ga can now be prepared in various measurement geometries applied in nuclear medicine. © 2017 Crown Copyright, Published by Elsevier Ltd. All
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    Primary standardisation of technetium-99m by liquid scintillation coincidence counting
    (Elsevier B. V., 2020-02) van Wyngaardt, WM; Tobin, SM; Lee, S; Smith, ML; Jackson, TW; Ilter, J; Howe, B; Sarbutt, A
    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