Abstract
The standardization of (99)Tc by several primary methods was investigated. This was performed to support a new (99)Tc transfer standard that has been developed and will be disseminated by the National Institute of Standards and Technology (NIST) as Standard Reference Material SRM 4288B. The standardization for the (99)Tc content of the solution was based on 4pibeta liquid scintillation (LS) measurements with (3)H-standard efficiency tracing (CIEMAT/NIST method). Confirmatory determinations were performed by 4pibeta(LS)-gamma(NaI) live-timed anti-coincidence (LTAC) counting and an LS-based 4pibeta triple-to-double coincidence ratio (TDCR) method.
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