Measurement of the activity and determination of the half-life of 225Ac at POLATOM

R Broda; T Ziemek; J Marganiec-Gałązka; M Czudek; K Kossert; A Listkowska; E Lech; Z Tymiński; P Saganowski; R Coulon; C Michotte

doi:10.1016/j.apradiso.2023.110987

Measurement of the activity and determination of the half-life of ²²⁵Ac at POLATOM

Appl Radiat Isot. 2023 Nov:201:110987. doi: 10.1016/j.apradiso.2023.110987. Epub 2023 Aug 16.

Authors

R Broda¹, T Ziemek², J Marganiec-Gałązka², M Czudek², K Kossert³, A Listkowska², E Lech², Z Tymiński², P Saganowski², R Coulon⁴, C Michotte⁴

Affiliations

¹ NCBJ Radioisotope Centre POLATOM, A. Sołtana 7, 05-400, Otwock, Poland. Electronic address: [email protected].
² NCBJ Radioisotope Centre POLATOM, A. Sołtana 7, 05-400, Otwock, Poland.
³ Physikalisch-Technische Bundesanstalt (PTB), Bundesallee 100, 38116, Braunschweig, Germany.
⁴ Bureau International des Poids et Mesures, Pavillon de Breteuil, 92312, Sèvres, Cedex, France.

PMID: 37660500
DOI: 10.1016/j.apradiso.2023.110987

Abstract

A method for absolute measurements of the ²²⁵Ac activity in equilibrium with its progeny was developed. Measurements were performed using the triple-to-double coincidence ratio (TDCR) method in two different TDCR counters. The activity concentration of an ²²⁵Ac solution was determined and the solution was sent to the SIR system for a comparison. The half-life of ²²⁵Ac was determined by one of the TDCR counters and found to be 9.9150(63) days.

Keywords: (225)Ac; Activity standardization; Counting efficiency; Half-life; TDCR.