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|Title:||Measurement of the 225Ac half-life|
|Authors:||POMME Stefaan; MAROULI MARIA; SULIMAN GABRIEL; DIKMEN HASAN; VAN AMMEL Raf; JOBBAGY VIKTOR; DIRICAN A.; STROH HEIKO; PAEPEN Jan; BRUCHERTSEIFER Frank; APOSTOLIDIS Christos; MORGENSTERN Alfred|
|Citation:||APPLIED RADIATION AND ISOTOPES vol. 70 no. 11 p. 2608-2614|
|Publisher:||PERGAMON-ELSEVIER SCIENCE LTD|
|Type:||Articles in Journals|
|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 59-141d, 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 10.0d, based on two old measurements lacking uncertainty evaluations.|
|JRC Institute:||Institute for Reference Materials and Measurements|
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