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.
POMME Stefaan;
SULIMAN Gabriel;
MAROULI Maria;
VAN AMMEL Raf;
JOBBAGY Viktor;
PAEPEN Jan;
STROH Heiko;
APOSTOLIDIS Christos;
ABBAS Kamel;
MORGENSTERN Alfred;
2012-12-05
PERGAMON-ELSEVIER SCIENCE LTD
JRC65539
0969-8043,
https://publications.jrc.ec.europa.eu/repository/handle/JRC65539,
10.1016/j.apradiso.2012.02.117,
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