Fenwick, A.
, Bergeron, D.
, Broder, B.
, Bendall, E.
, Cessna, J.
, Collins, S.
, Pibida, L.
, Ramirez, N.
and Napoli, E.
(2025),
A bilateral comparison of 227Th activity standards between NPL and NIST, Metrologia, [online], https://doi.org/10.1088/1681-7575/adac65, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=958444
(Accessed April 10, 2025)
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A bilateral comparison of 227Th activity standards between NPL and NIST
Published
Author(s)
Andrew Fenwick, , Brittany Broder, Emma Bendall, , Sean Collins, , Natasha Ramirez, Elisa Napoli
Abstract
The National Physical Laboratory (United Kingdom) and the National Institute of Standards and Technology (United States) each determined the massic activity and effective separation time of a common solution of 227Th. Measurements at both laboratories were performed before radioactive equilibrium. Particular challenges associated with pre-equilibrium comparisons are addressed and multiple comparison models are presented. The direct comparison showed good accord between the laboratories' activity standards.Citation
Metrologia
Volume
62
Pub Type
Journals
Download Paper
Keywords
Th-227, targeted alpha therapy, administered activity, radionuclide calibrator, ionisation chamber, gamma spectrometry, time-dependent activity calibration, international standards, comparison
Citation
Issues
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Created February 3, 2025