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Ra-224 activity, half-life, and 241 keV gamma ray absolute emission intensity: A NIST-NPL bilateral comparison.
Bergeron, Denis E; Collins, Sean M; Pibida, Leticia; Cessna, Jeffrey T; Fitzgerald, Ryan; Zimmerman, Brian E; Ivanov, Peter; Keightley, John D; Napoli, Elisa.
Afiliación
  • Bergeron DE; Radiation Physics Division, National Institute of Standards and Technology, Gaithersburg, MD, 20899, USA. Electronic address: denis.bergeron@nist.gov.
  • Collins SM; National Physical Laboratory, Teddington, Middlesex, TW11 0LW, UK; Department of Physics, University of Surrey, Stag Hill, Guildford, GU2 7XH, UK.
  • Pibida L; Radiation Physics Division, National Institute of Standards and Technology, Gaithersburg, MD, 20899, USA.
  • Cessna JT; Radiation Physics Division, National Institute of Standards and Technology, Gaithersburg, MD, 20899, USA.
  • Fitzgerald R; Radiation Physics Division, National Institute of Standards and Technology, Gaithersburg, MD, 20899, USA.
  • Zimmerman BE; Radiation Physics Division, National Institute of Standards and Technology, Gaithersburg, MD, 20899, USA.
  • Ivanov P; National Physical Laboratory, Teddington, Middlesex, TW11 0LW, UK.
  • Keightley JD; National Physical Laboratory, Teddington, Middlesex, TW11 0LW, UK.
  • Napoli E; Oncoinvent AS, Oslo, Norway; Department of Radiation Biology, Institute for Cancer Research, Oslo University Hospital, Oslo, Norway; Institute of Clinical Medicine, University of Oslo, Oslo, Norway.
Appl Radiat Isot ; 170: 109572, 2021 Apr.
Article en En | MEDLINE | ID: mdl-33461017
ABSTRACT
The national metrology institutes for the United Kingdom (UK) and the United States of America (USA) have compared activity standards for 224Ra, an α-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.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Tipo de estudio: Guideline Idioma: En Revista: Appl Radiat Isot Asunto de la revista: MEDICINA NUCLEAR / SAUDE AMBIENTAL Año: 2021 Tipo del documento: Article
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Tipo de estudio: Guideline Idioma: En Revista: Appl Radiat Isot Asunto de la revista: MEDICINA NUCLEAR / SAUDE AMBIENTAL Año: 2021 Tipo del documento: Article