Abstract
An ampoulated uranyl nitrate solution has been compared with NBL CRM 112-A for isotopic-amount ratios as initial verification work for a future mass spectrometry-specific Normal Uranium (NU) reference material. Randomly selected ampoules of the NU solution were analyzed to assess homogeneity of the production run. The comparison analyses were performed by TIMS using Total Evaporation (TE) and Modified Total Evaporation (MTE) methods. No difference was found for the n(235U)/n(238U) and n(234U)/n(238U) isotope-amount ratios between the NU solution and the CRM 112-A material. Moreover, the NU solutions appear to be isotopically homogenous with no statistically significant unit-to-unit difference observed.
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