Half-life determination and comparison of activity standards of 231Pa

Autor: Haoran Liu, Ross W. Williams, Stefaan Pommé, Karsten Kossert, Maria Marouli, John Keightley, C Michotte, A. Honig, Rainer Dersch, S. Röttger, Simon Jerome, Raphael Galea, Philippe Cassette, Ming Zhang, Juncheng Liang, Christophe Bobin
Rok vydání: 2020
Předmět:
Zdroj: Applied Radiation and Isotopes. 155:108837
ISSN: 0969-8043
DOI: 10.1016/j.apradiso.2019.108837
Popis: The results of an international comparison of activity measurements of a solution of 231Pa are reported and analysed. Prior to this, no known standardisation of 231Pa by activity measurement had been carried out. The comparison was run in 2017–2018 involving eight laboratories, and returned results with no identifiable inconsistencies between methods or laboratories. The results, including one mass determination, gave a231Pa activity concentration of 41.461(48) kBq g−1 and a231Pa atom concentration of 61.48(23) × 1015 atoms g−1, from which a half-life value of 32 570(130) years was derived.
Databáze: OpenAIRE