Primary standardization of 224 Ra activity by liquid scintillation counting

A standard for activity of Ra in secular equilibrium with its progeny has been developed, based on triple-to-double coincidence ratio (TDCR) liquid scintillation (LS) counting. The standard was confirmed by efficiency tracing and 4παβ(LS)-γ(NaI(Tl)) anticoincidence counting, as well as by 4πγ ioniza...

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Bibliographic Details
Published in:Applied radiation and isotopes 2020-01, Vol.155, p.108933
Main Authors: Napoli, Elisa, Cessna, Jeffrey T, Fitzgerald, Ryan, Pibida, Leticia, Collé, Ronald, Laureano-Pérez, Lizbeth, Zimmerman, Brian E, Bergeron, Denis E
Format: Article
Language:English
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Summary:A standard for activity of Ra in secular equilibrium with its progeny has been developed, based on triple-to-double coincidence ratio (TDCR) liquid scintillation (LS) counting. The standard was confirmed by efficiency tracing and 4παβ(LS)-γ(NaI(Tl)) anticoincidence counting, as well as by 4πγ ionization chamber and NaI(Tl) measurements. Secondary standard ionization chambers were calibrated with an expanded uncertainty of 0.62% (k = 2). Calibration settings were also determined for a 5 mL flame-sealed ampoule on several commercial reentrant ionization chambers (dose calibrators).
ISSN:1872-9800