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Primary standardisation of technetium-99m by liquid scintillation coincidence counting
W M van Wyngaardt1, S M Tobin1, S Lee1
1Australian Nuclear Science and Technology Organisation, New Illawarra Rd, Lucas Heights, 2234, NSW, Australia.
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.
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