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|Title:||Improvements in Precision and Accuracy of Uranium Isotope Ratio Measurements for Reference Materials Certification at IRMM|
|Authors:||ALONSO MUNOZ ADOLFO; KUEHN HEINZ; VERBRUGGEN ANDRE; WELLUM Roger; TAYLOR PHILIP|
|Other Contributors:||RICHTER STEPHAN|
|Citation:||Symposium On Safeguards and Nuclear Material Management|
|Publisher:||EC JRC Ispra (ESARDA)|
|Type:||Contributions to Conferences|
|Abstract:||For the certification of nuclear isotopic reference materials a new state-of-the-art thermal-ionisation mass-spectrometer (TIMS), the Thermo Electron “Triton”, was installed at IRMM in January 2004. Significant progress has been made particularly for measurements of the 234U/238U and 236U/238U (the so-called “minor”) isotope ratios. Using new measurement procedures for the Triton mass spectrometer, more precise and accurate isotopic data for the minor isotopic ratios have been obtained for a number of old and new reference materials, thus allowing a (re-) certification of their isotopic composition. This includes the well known IRMM-183-187 series and also the REIMEP 15 campaign samples. During the re-certification of the REIMEP 15 samples, the observed deviation between the participant results and the previously certified ratios by IRMM in certain cases has been overcome.|
|JRC Institute:||Institute for Reference Materials and Measurements|
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