%0 Journal Article
%T Activity standard and calibrations for 227Th with ingrowing progeny.
%A Bergeron DE
%A Cessna JT
%A Broder BA
%A Pibida L
%A Fitzgerald RP
%A DiGiorgio M
%A Napoli E
%A Zimmerman BE
%J Appl Radiat Isot
%V 209
%N 0
%D 2024 Jul 20
%M 38701595
%F 1.787
%R 10.1016/j.apradiso.2024.111326
%X Thorium-227 was separated from its progeny and standardized for activity by the triple-to-double coincidence ratio (TDCR) method of liquid scintillation counting. Confirmatory liquid scintillation-based measurements were made using efficiency tracing with 3H and live-timed anticoincidence counting (LTAC). The separation time and the efficiency of the separation were confirmed by gamma-ray spectrometry. Calibrations for reentrant pressurized ionization chambers, including commercial radionuclide calibrators, and a well-type NaI(Tl) detector are discussed.