2025-06-03 米国国立標準技術研究所(NIST)
Credit: S. Kelley/NIST
<関連情報>
- https://www.nist.gov/news-events/news/2025/06/new-nist-standard-helps-deliver-right-dosage-cancer-fighting-drugs
- https://www.sciencedirect.com/science/article/abs/pii/S0969804324004585
225Acとその子孫核種の放射平衡における放射能測定と校正 Activity measurements and calibrations for 225Ac in radioactive equilibrium with its progeny
Denis E. Bergeron, Gulakhshan Hamad, Brittany A. Broder, Jeffrey T. Cessna, Adam J. Pearce, Jerome LaRosa, Leticia Pibida, Rhys Salter, Neha S. Saxena, Brian E. Zimmerman
Applied Radiation and Isotopes Available online: 9 December 2024
DOI:https://doi.org/10.1016/j.apradiso.2024.111630
Highlights
- Ac-225 activity was determined by primary liquid scintillation methods.
- Settings for radionuclide calibrators (“dose calibrators”) were determined.
- Comparison with Monte Carlo models.
- An ampoule was submitted to the International Reference System (SIR).
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.
