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|Title:||Experimental Determination of the 233U Half-Life|
|Authors:||POMME Stefaan; ALTZITZOGLOU Timotheos; VAN AMMEL Raf; SIBBENS Goedele; EYKENS Roger; RICHTER Stephan; CAMPS Johan; KOSSERT Karsten; JANSSEN Herbert; GARCIA-TORANO Eduardo; DURAN Teresa; JAUBERT Florent|
|Citation:||METROLOGIA vol. 46 no. 5 p. 439-449|
|Publisher:||IOP PUBLISHING LTD|
|JRC Publication N°:||JRC51190|
|Type:||Articles in Journals|
|Abstract:||The half-life of 233U was determined by a specific activity method. A purified, highly enriched 233U solution was prepared with certified concentration of uranium isotopes. The isotopic composition of the uranium material was determined by thermal ionisation mass spectrometry. The ingrowth of daughter nuclides was calculated and confirmed by alpha and gamma-ray spectrometry. Quantitative sources were prepared from aliquots of the 233U solution and their disintegration rate was determined by means of alpha-particle counting at a defined small solid angle, liquid scintillation counting and 4pi counting in a pressurised proportional counter and in a CsI(Tl) sandwich spectrometer. A half-life value of 1.5867 (14) 10 5 a was obtained, in which the relative standard uncertainty amounts to 0.09%. The result is lower than the currently recommended value.|
|JRC Institute:||Institute for Reference Materials and Measurements|
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