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Lassina Zerbo, Executive Secretary of the CTBTO Preparatory Commission, wrote in her Twitter post that SEP63 had recorded levels of radioactive cesium “above normal (but not harmful to human health)” from June 22 to 23. and the concentration of ruthenium isotopes (Ru-103) involved in nuclear fission reactions.
The map published by Zerb shows the area where this contamination, which may have occurred in the past three days, may have been the source. This area includes part of the Baltic Sea, the Baltic States, southern Sweden, part of Denmark, Finland, and the northwestern part of Russia, near Saint Petersburg.
A CTBDTO official told western media that the radioactive material was likely to have spread from some civilian nuclear facility, but added that his organization was not authorized to identify the specific source.
At the time, Russia stated that it had not detected any increase in the concentration of radioactive materials.
The Russian meteorological agency Rosgidromet stated that measurement stations operating in the Baltic Sea recorded a radiation range that does not exceed the norm of 1.11-1.15 microsieverts per hour.
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