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|Title:||Measurement of the 226Th and 222Ra half-lives|
|Authors:||POMME Stefaan; SULIMAN GABRIEL; MAROULI MARIA; VAN AMMEL Raf; JOBBAGY VIKTOR; PAEPEN Jan; STROH HEIKO; APOSTOLIDIS Christos; ABBAS Kamel; MORGENSTERN Alfred|
|Citation:||APPLIED RADIATION AND ISOTOPES vol. 70 no. 9 p. 1913-1918|
|Publisher:||PERGAMON-ELSEVIER SCIENCE LTD|
|Type:||Contributions to Conferences|
|Abstract:||The half-lives of 226Th and 222Ra were measured by counting alpha-particle emissions from sources as a function of time. The 226Th sources were prepared from an open 230U source, capturing recoil atoms after alpha-particle decay on glass disks or even directly on to a detector. Similarly, the 222Ra sources were obtained by self-transfer of recoil atoms from 226Th sources. The activity measurements were performed in (nearly-)2pi geometry with an ion-implanted silicon detector. The decay curves were analysed in different ways, incl. moment analysis, trying to avoid the pitfalls of bias of least-squares fits to Poisson distributed data. The observed half-life values are T1/2(226Th)=30.70 (3) min and T1/2(222Ra)=33.6 (4) s. Literature values show some inconsistency.|
|JRC Institute:||Institute for Reference Materials and Measurements|
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