{Reference Type}: Journal Article
{Title}: Activity standard and calibrations for 227Th with ingrowing progeny.
{Author}: Bergeron DE;Cessna JT;Broder BA;Pibida L;Fitzgerald RP;DiGiorgio M;Napoli E;Zimmerman BE;
{Journal}: Appl Radiat Isot
{Volume}: 209
{Issue}: 0
{Year}: 2024 Jul 20
{Factor}: 1.787
{DOI}: 10.1016/j.apradiso.2024.111326
{Abstract}: 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.