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The Nuclear Signatures Interlaboratory Measurement Evaluation Programme (NUSIMEP) has been established to support the growing need to measure the isotopic abundances of elements characteristic of the nuclear fuel cycle present in trace amounts in the environment. Such measurements are required for safeguards applications as well as for the implementation of the Non-Proliferation Treaty (NPT). Through this and similar programmes, the degree of equivalence of measurements from individual laboratories on the international scene can be ascertained.

This report contains all participants' results (in graphical form) obtained in the present round of this programme, NUSIMEP-2: uranium isotopic ratios. The participants were asked to measure isotopic compositions of uranium of natural or close to natural isotopic composition on a sample of restricted size (approximately 100 ng uranium as dry uranyl nitrate). The participating laboratories received certified test samples (with undisclosed isotopic composition), which they were asked to analyse using the laboratory's routine procedures. The measurement results of participants were evaluated against certified reference values, traceable to the SI.

In total 45 laboratories participated in the NUSIMEP-2 round. Thirty sets of results were finally submitted, originating from 17 countries all over the world. This report presents in a graphical form the results of all participants together with the reference values.

The report can be downloaded from the IRRM website at:

Additional information

Authors: HELD A ET AL, European Commission, Joint Research Centre, Institute for Reference Materials and Measurements (IRMM), Geel (BE)
Bibliographic Reference: EUR 19744 EN (2001), pp.37. Euro: Free of charge
Availability: Available from European Commission, JRC Knowledge Management Unit, Ispra (IT) Tel: +39 033278 9843 or +39 033278 9864 Fax: +39 033278 9623 E-mail:
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