Slovenian–Romanian bilateral intercomparison on tritium samples

• Bilateral intercomparison on low level tritium activity in natural waters.
• Tritium activities determined with liquid scintillation spectrometry.
• Comparison shows good agreement between both laboratories.
• Some ideas gained to improve and harmonize results.

A Slovenian laboratory from the Jožef Stefan Institute (JSI) and a Romanian laboratory from the National Research and Development Institute for Cryogenics and Isotopic Technologies (ICIT) performed bilateral intercomparisons of tritium determination in environmental samples. On the basis of the results, the measurement and analysis methods were compared. Comparability and traceability were confirmed with the results from international radioactivity proficiency test exercises organized by IAEA and NPL where both laboratories participated. New knowledge gained leads to harmonized, precise and traceable results of low level tritium environmental samples measurements.