The Joint Research Centre Karlsruhe site of the European Commission is using 2 types of thermal ionisation mass spectrometers (TIMS), Finnigan MAT 26X and Triton for routine uranium and plutonium isotope ratio measurements.

1 Triton and 1 MAT 26x are located in the on-site laboratory at Sellafield, United Kingdom (OSL). 1 MAT 26x is located in the on-site laboratory at La Hague, France (LSS). And 1 MAT 262 and 1 Triton are installed at the JRC in Karlsruhe, Germany.

For each individual measurement with a thermal ionisation mass spectrometer a Re double filament holder, a W double filament holder and an extraction plate are necessary to perform the analysis.

Therefore the conclusion of a framework contract with a reliable supplier is necessary in order to assure the timely delivery of the needed filaments to all sites.

Approx. 300 boxes containing 15 pieces of double filament holder with a rhenium standard filament attached (0,04 mm thick and 0,7 mm wide ±1 %).

Approx. 300 boxes containing 15 pieces of double filament holder with a tungsten filament attached (0,04 mm thick and 0,7 mm wide ±1 %).

Approx. 300 boxes containing 15 extraction plates.