Bergeron, D.
, Hamad, G.
, Broder, B.
, Cessna, J.
, Pearce, A.
, LaRosa, J.
, Pibida, L.
and Zimmerman, B.
(2024),
Activity measurements and calibrations for 225Ac in radioactive equilibrium with its progeny, Applied Radiation and Isotopes, [online], https://doi.org/10.1016/j.apradiso.2024.111630, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=958355
(Accessed October 28, 2025)
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Activity measurements and calibrations for 225Ac in radioactive equilibrium with its progeny
Published
Author(s)
, Gulakhshan Hamad, Brittany Broder, , , , ,
Abstract
The massic activity of 225Ac in 0.1 mol/L HCl was measured by multiple primary methods over four consistent measurement campaigns. Results from the triple-to-double coincidence ratio (TDCR) method of liquid scintillation (LS) counting were in accord with other LS-based primary methods. The calibration of commercial radionuclide calibrators ("dose calibrators") is described, with discussion of current literature values. Comparisons between experimental ionization chamber and NaI(Tl) well counter responses and benchmarked Monte Carlo models are addressed.Citation
Applied Radiation and Isotopes
Volume
217
Pub Type
Journals
Download Paper
Keywords
Actinium-225, activity standard, liquid scintillation counting, TDCR, gamma-ray spectrometry, radionuclide calibrator, radiopharmaceutical therapy, targeted alpha therapy, long-lived impurities, breakthrough
Citation
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Created December 9, 2024, Updated December 16, 2024