Title: Half-lives of 221Fr, 217At, 213Bi, 213Po and 209Pb from the 225Ac decay series
Authors: SULIMAN GABRIELPOMME StefaanMAROULI MariaVAN AMMEL RafSTROH HEIKOJOBBAGY ViktorPAEPEN JanDIRICAN A.BRUCHERTSEIFER FrankAPOSTOLIDIS ChristosMORGENSTERN Alfred
Citation: APPLIED RADIATION AND ISOTOPES vol. 77 p. 32-37
Publisher: PERGAMON-ELSEVIER SCIENCE LTD
Publication Year: 2013
JRC N°: JRC79966
ISSN: 0969-8043
URI: http://www.sciencedirect.com/science/article/pii/S0969804313000584
http://publications.jrc.ec.europa.eu/repository/handle/JRC79966
DOI: 10.1016/j.apradiso.2013.02.008
Type: Articles in periodicals and books
Abstract: The half-lives of 221Fr, 217At, 213Bi, 213Po, and 209Pb were measured by means of an ion-implanted planar Si detector for alpha and beta particles emitted from weak 225Ac sources or from recoil sources, which were placed in a quasi-2 pi counting geometry. Recoil sources were prepared by collecting atoms from an open 225Ac source onto a glass substrate. The 221Fr and 213Bi half-lives were determined by following the alpha particle emission rate of recoil sources as a function of time. Similarly, the 209Pb half-life was determined from the beta particle count rate. The shorter half-lives of 217At and 213Po were deduced from delayed coincidence measurements on weak 225Ac sources using digital data acquisition in list mode. The resulting values: T1/2(221Fr)=4.806 (6) min, T1/2(217At)=32.8 (3) ms, T1/2(213Bi)=45.62 (6) min, T1/2(213Po)=3.708 (8) micro s and T1/2(209Pb)=3.232 (5) h were in agreement only with the best literature data.
JRC Directorate:Health, Consumers and Reference Materials

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