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  • Evaluation of uncertainties for Pu and U measurements achieved in the on-site laboratory by Thermal Ionization Mass Spectrometry during two years of operation


The quality control concept of the on-site laboratory is based on a nested design of independent quality checks. It makes use of method inter comparison, sub sample comparison, measurement of working standards and measurement of certified reference materials. With respect to method inter comparison, thermal ionisation mass spectrometry is used as reference basis for the radiometric methods. This applied for both isotope analysis and isotope dilution analysis.

This paper discusses the experience gained with the quality control system in thermionic mass spectrometry measurements based on two years of operational experience. It describes the precisions and accuracies observed for the different types of measurements (isotope abundance, minor isotope abundance, isotope dilution) and shows the performance the technique has exhibited over two years of routine operation. The main sources of uncertainty of the analytical result will be discussed as well. .

Additional information

Authors: ZULEGER E ET AL, JRC, Institute for Transuranium Elements, Karlsruhe (DE)
Bibliographic Reference: An oral report given at: The International Symposium on International Safeguards û Verification and Nuclear Material Security. Held in: Vienna (AT), 29 October - 1 November 2001
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