Round robin for uranium isotopic measurements by mass spectrometry |
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Authors: | G Granier F Pointurier and F Chartier |
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Institution: | (1) Commissariat à l’énergie Atomique (CEA), DEN, DRCP/CETAMA, B.P. 17171, F-30207 Bagnols-sur-Cèze, France;(2) Commissariat à l’énergie Atomique (CEA), DAM, DIF, F-91297 Arpajon, France;(3) Commissariat à l’énergie Atomique (CEA), DEN, DPC, F-91191 Gif-sur-Yvette, France |
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Abstract: | A round-robin for uranium isotopic analysis in two solutions with different concentrations prepared and certified by the Institute
for Reference Materials and Measurements (IRMM, Geel, Belgium) was organized by CETAMA, a division of the Commissariat à l’énergie
Atomique (CEA: French Atomic Energy Commission Fourteen laboratories took part in the program using twenty-five different
instruments (ICP-QMS, ICP-SFMS and TIMS). For each solution and each isotopic ratio, a statistical analysis based on standard
ISO 5725 was carried out to calculate the mean, the repeatability and reproducibility standard deviations, the z-score and
zeta-score, the bias with respect to the target values, and to compare their precision. The mean measurement results for the
234U/238U and 235U/238U isotopic ratios show no significant biases compared with the target values, whatever is the analytical technique. The results
were much less satisfactory for the 236U/238U isotopic ratio, for which only the laboratories specialized in traces analyses and/or precise isotopic analyses submitted
results in good agreement with the target values. A detailed discussion is given in this article. |
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