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|Title:||Half-lives of 221Fr, 217At, 213Bi, 213Po and 209Pb from the 225Ac decay series|
|Authors:||SULIMAN GABRIEL; POMME Stefaan; MAROULI Maria; VAN AMMEL Raf; STROH HEIKO; JOBBAGY Viktor; PAEPEN Jan; DIRICAN A.; BRUCHERTSEIFER Frank; APOSTOLIDIS Christos; MORGENSTERN Alfred|
|Citation:||APPLIED RADIATION AND ISOTOPES vol. 77 p. 32-37|
|Publisher:||PERGAMON-ELSEVIER SCIENCE LTD|
|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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