Re-Certification of the IRMM-183-187 Series of Uranium Nitrate Solution Reference Materials
Certified for Isotope Ratios
This report describes the re-certification of the IRMM-183-187 series of uranium nitrate solution reference materials, certified for the uranium isotopic composition. This certification project was a collaboration between the Joint Research Centre’s Unit G.2 in Geel/Belgium, the IAEA, ORNL and the CEA.
The IRMM-183-187 series of reference materials were originally certified in the 1980's-1990's. The so-called “major” isotope ratios n(235U)/n(238U) were certified using gas source mass Spectrometry (GSMS) and the so-called minor isotope ratios n(234U)/n(238U) and n(236U)/n(238U) using thermal ionization mass spectrometry (TIMS). The minor ratios were re-certified in 2005. A re-certification project was started by JRC-G2 in 2019, which included a complete re-characterization of the IRMM-183-187 series. For the measurement of the major ratios the double spike method (TIMS/DS) according to ASTM C1871 and for the minor ratios the modified total evaporation method (TIMS/MTE) according to ASTM C1832 were used. New verification measurements were performed using TIMS/MTE by ORNL and CEA, and historical data for TIMS/MTE measurements on three instruments from 2012-2021 were obtained from the IAEA. Based on the good agreement of the verification measurements and historical data with the new measurement results obtained during the re-characterization at JRC-G2, the isotope ratios of the IRMM-183-187 series were re-certified.
RICHTER Stephan;
HENNESSY Carmel;
JAKOBSSON Ulf;
AREGBE Yetunde;
HEXEL Cole;
2022-06-16
Publications Office of the European Union
JRC129154
978-92-76-52116-7 (online),
OP KJ-06-22-197-EN-N (online),
https://publications.jrc.ec.europa.eu/repository/handle/JRC129154,
10.2760/312568 (online),
Additional supporting files
| File name | Description | File type | |
|---|
