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|Title:||The Isotopic Composition of Natural Uranium Samples - Measurements Using the New n(233U)/n(236U) Double Spike IRMM-3636|
|Authors:||RICHTER STEPHAN; ALONSO MUNOZ ADOLFO; EYKENS ROGER; JAKOBSSON ULF; KUEHN HEINZ; VERBRUGGEN ANDRE; AREGBE YETUNDE; KEEGAN Elizabeth; WELLUM Roger|
|Citation:||INTERNATIONAL JOURNAL OF MASS SPECTROMETRY vol. 269 no. 1-2 p. 145-148|
|Publisher:||ELSEVIER SCIENCE BV|
|Type:||Articles in periodicals and books|
|Abstract:||The new double spike isotope reference material IRMM-3636 was prepared gravimetrically using highly enriched 233U and 236U isotopic material. The n(233U)/n(236U) ratio was certified with an extended relative uncertainty of 0.016%. By mixing the n(233U)/n(236U) double spike with a sample and applying internal mass fractionation correction, the n(235U)/n(238U) ratio of the sample can be determined with the highest possible precision and accuracy. The IRMM-3636 double spike was applied for measurements of natural uranium ore samples. The results for n(235U)/n(238U) ratios were compared to earlier data obtained using UF6 gas sources mass spectrometry and to the recommended IUPAC value. The results clearly show that the historically used consensus value of 1/137.88 cannot be considered representative for natural uranium samples in general.|
|JRC Institute:||Health, Consumers and Reference Materials|
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