Federal Environmental, Industrial and Nuclear Supervision Service informs that Rostechnadzor has timely received and analyzed the information on detection in the late September - early October 2017 of ruthenium-106 (Ru-106) in the atmosphere of certain European countries.
The detected across Europe Ru-106 activity levels varied widely from 10 μBq (microbecquerel) to 100 mBq (millibequerel) per cubic meter of air with the maximum reached as high as 145 mBq/m3 that was registered in Bucharest on 30.09.2017.
Assuming that the uncontrolled release of that isotope could arise from the activity related to spent nuclear fuel reprocessing or radionuclide sources manufacture, Rostechnadzor in the period of 26 October to 3 November 2017 conducted an inspection of implementing the radiation control measures in regard to radioactive substance release sources at FSUE ‘PO Mayak’ (City of Ozersk, Chelyabinsk region), which belongs to the State Corporation ‘Rosatom’.
The inspection revealed that during August-October 2017 onsite FSUE ‘PO Mayak’,within its sanitary-protection zone and control area, the specific radionuclide activity in the ground air, including specific activity of Ru-106 didn’t exceed the acceptable and reference levels as set for the enterprise. The inspection didn’t reveal any violations that might bear relation to exercising radiation control over radioactive substance release sources, as well as to equipment performance and conduct of processes that might have caused the Ru-106 release in the atmosphere.