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Liquid scintillation efficiencies, gamma-ray emission intensities, and half-life for Gd-153



Denis E. Bergeron, Jeffrey T. Cessna, Ryan P. Fitzgerald, Gulakhshan Hamad, Lizbeth Laureano-Perez, Leticia Pibida, Brian E. Zimmerman


Gadolinium-153 was standardized for activity by live-timed anticoincidence counting and an ampoule was submitted to the international reference system (SIR). Absolute emission intensities for the main γ rays were determined with calibrated high-purity germanium (HPGe) and lithium-drifted silicon (Si(Li)) detectors. A revised decay scheme is indicated, with no probability of direct electron capture to the 153Eu ground state. Triple-to-double coincidence ratio (TDCR) efficiency curves indicate that the revised decay scheme is consistent with experiment. Half-life measurements agree with a previous NIST determination and show no sensitivity to chemical environment.
Applied Radiation and Isotopes


Activity standard, intercomparison, international reference system, electron capture, decay scheme, nuclear decay data, TDCR, efficiency tracing


Bergeron, D. , Cessna, J. , Fitzgerald, R. , Hamad, G. , Laureano-Perez, L. , Pibida, L. and Zimmerman, B. (2023), Liquid scintillation efficiencies, gamma-ray emission intensities, and half-life for Gd-153, Applied Radiation and Isotopes, [online],, (Accessed March 3, 2024)
Created November 9, 2023, Updated November 27, 2023