The first signs of the nuclear pollution appeared in the late September and the beginning of October and it was spread all over the European countries.
According to the research of the IRSN based on the weather patterns, the cloud originated from the nuclear facility situated between the Urals Mountains and the Volga River so it can be in Russia or Kazakhstan.
The IRSN experts appealed to the authorities of Russian and Kazakhstan despite the fact that it did not harm humans or the environment of Europe. Russia responds that it does not possess any information on the nuclear incident over its territory and it could not immediately respond. Moreover, the IRSN did not succeed to contact with Kazakh authorities or the Kazakh embassy in Moscow.
Also, IRSN stated that the report on this incident will be submitted to the UN if Russia and Kazakhstan fail to establish the source of the nuclear cloud.
According to the research of the IRSN, ruthenium-106, the radioactive nuclide found in the air is the product of the splitting atoms in a reactor and the possibility of the natural occurrence is excluded. The approximate quantity of released ruthenium is 100-300 terabecquerels that is the significantly great amount.