Ruthenium-106 event (air concentration samples)

Between the end of September and early October 2017, several European networks involved in the monitoring of atmospheric radioactive contamination recorded 106Ru presence. Some regions of Central and Eastern Europe measured one-day mean activity concentrations up to 10-100 mBq/m³, although the resulting exposure were far below radiological concern. Based on the meteorological conditions and modelling analysis, the most plausible zone of release, lies in the Southern Ural region of Russia and possibly Northern Kazakhstan, although it continues unknown until today.