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  • Title: Half-lives of 221Fr, 217At, 213Bi, 213Po and 209Pb from the 225Ac decay series.
    Author: Suliman G, Pommé S, Marouli M, Van Ammel R, Stroh H, Jobbágy V, Paepen J, Dirican A, Bruchertseifer F, Apostolidis C, Morgenstern A.
    Journal: Appl Radiat Isot; 2013 Jul; 77():32-7. PubMed ID: 23511775.
    Abstract:
    The half-lives of (221)Fr, (217)At, (213)Bi, (213)Po, and (209)Pb were measured by means of an ion-implanted planar Si detector for alpha and beta particles emitted from weak (225)Ac sources or from recoil sources, which were placed in a quasi-2π counting geometry. Recoil sources were prepared by collecting atoms from an open (225)Ac source onto a glass substrate. The (221)Fr and (213)Bi half-lives were determined by following the alpha particle emission rate of recoil sources as a function of time. Similarly, the (209)Pb half-life was determined from the beta particle count rate. The shorter half-lives of (217)At and (213)Po were deduced from delayed coincidence measurements on weak (225)Ac sources using digital data acquisition in list mode. The resulting values: T1/2((221)Fr)=4.806 (6) min, T1/2((217)At)=32.8 (3)ms, T1/2((213)Bi)=45.62 (6)min, T1/2((213)Po)=3.708 (8) μs, and T1/2((209)Pb)=3.232 (5)h were in agreement only with the best literature data.
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