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  • Title: Measurement of the 225Ac half-life.
    Author: Pommé S, Marouli M, Suliman G, Dikmen H, Van Ammel R, Jobbágy V, Dirican A, Stroh H, Paepen J, Bruchertseifer F, Apostolidis C, Morgenstern A.
    Journal: Appl Radiat Isot; 2012 Nov; 70(11):2608-14. PubMed ID: 22940415.
    Abstract:
    The (225)Ac half-life was determined by measuring the activity of (225)Ac sources as a function of time, using various detection techniques: α-particle counting with a planar silicon detector at a defined small solid angle and in a nearly-2π geometry, 4πα+β counting with a windowless CsI sandwich spectrometer and with a pressurised proportional counter, gamma-ray spectrometry with a HPGe detector and with a NaI(Tl) well detector. Depending on the technique, the decay was followed for 59-141 d, which is about 6-14 times the (225)Ac half-life. The six measurement results were in good mutual agreement and their mean value is T(1/2)((225)Ac)=9.920 (3)d. This half-life value is more precise and better documented than the currently recommended value of 10.0 d, based on two old measurements lacking uncertainty evaluations.
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