A. Alonso

TL;DR: In this article, a set of six samples, collected worldwide from various uranium ore mining facilities, was analysed for uranium isotopic composition by high accuracy isotope mass spectrometry. And the results of the measured isotope composition is traceable to the SI system.

TL;DR: The IRMM-074 series as mentioned in this paper is a new series of gravimetrically prepared uranium isotope reference materials, the so-called IRMM -074, with the n((235)U)/n((238)U) isotope ratio held constant at unity and n((233)U/n((231)U)) isotope ratios varying from 1.0 to 10−6.

TL;DR: In this article, the isotopic composition of the IRMM 183-187 series was re-measured and re-certified with significantly reduced uncertainties for the 234U/238U and 236U/ 238U isotope ratios.

TL;DR: The results of the REIMEP 18 campaign confirm in general the excellent capability of nuclear safeguards and scientific laboratories in measuring isotopic abundances of uranium, although some problems were discovered for the measurements of the minor isotope ratios n(U-234)/n-U-238 and n(Us 236)/n(Us 238) and the calculation of measurement uncertainties for isotope ratio in general as mentioned in this paper.

TL;DR: The range of isotope compositions in currently available commercial uranium chemicals, offered in different chemical forms and used for different purposes (e.g., atomic absorption spectrometer or inductively coupled plasma mass spectrometry) were measured by high accuracy isotope mass spectra as mentioned in this paper.