Evaluation of Cs, Xe and H activity concentrations monitored in the Arctic atmosphere.

This paper provides a brief introduction to the Arctic atmospheric radioactivity monitoring network. A decade of monitoring results have shown the Cs background levels in Arctic air range from 0.05 to 1.

The dispersion of 99Tc in the Nordic Seas and the Arctic Ocean: a comparison of model results and observations.

The radionuclide (99)Tc had been discharged from the nuclear reprocessing facility in Sellafield (UK) into the Irish Sea in increased amounts in the 1990s. We compare the simulated dispersion of (99)Tc in surface water as calculated by a hydrodynamic model and an assessment box model with field-observations from 1996 to 1999 to study concentrations, pathways and travel times. The model results are consistent with the observations and show the typical pathway of dissolved radionuclides from the Irish Sea via the North Sea along the Norwegian Coast.