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Ra-224 activity, half-life, and 241 keV gamma ray absolute emission intensity: A NIST-NPL bilateral comparison

Bergeron, D E; Collins, S M; Pibida, L; Cessna, J T; Fitzgerald, R; Zimmerman, B E; Ivanov, P; Keightley, J D; Napoli, E (2021) Ra-224 activity, half-life, and 241 keV gamma ray absolute emission intensity: A NIST-NPL bilateral comparison. Applied Radiation and Isotopes, 170. 109572 ISSN 09698043

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Abstract

The national metrology institutes for the United Kingdom (UK) and the United States of America (USA) have compared activity standards for 224Ra, an γ-particle emitter of interest as the basis for therapeutic radiopharmaceuticals. Solutions of 224RaCl2 were assayed by absolute methods, including digital coincidence counting and triple-to-double coincidence ratio liquid scintillation counting. Ionization chamber and high-purity germanium (HPGe) γ-ray spectrometry calibrations were compared; further, a solution was shipped between laboratories for a direct comparison by HPGe spectrometry. New determinations of the absolute emission intensity for the 241 keV γ ray (Iγ = 4.011(16) per 100 disintegrations of 224Ra) and of the 224Ra half-life (T1/2 = 3.6313(14) d) are presented and discussed in the context of previous measurements and evaluations.

Item Type: Article
Keywords: Decay constant; emission probability; coincidence counting; TDCR; ionization chamber; gamma-ray spectrometry; activity standard; comparison; alpha therapy
Subjects: Ionising Radiation > Radioactivity
Divisions: Medical, Marine & Nuclear
Identification number/DOI: 10.1016/j.apradiso.2020.109572
Last Modified: 27 Jul 2021 14:04
URI: http://eprintspublications.npl.co.uk/id/eprint/9263

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