Abstract
This article presents the results of radiometric observations carried out by the departments of the Federal Service for Hydrometeorology and Environmental Monitoring of Russia after the accident at the Fukushima NPP. Iodine-131 radioisotopes were first detected in the European territory of Russia (ETR) on the 23rd of March; in Southern and the Northern Siberia — on March 26th. In the ETR the volumetric activity of 131I (only the particulate form of I-131 was measured) sharply increased from the 28th to the 30th of March. Together with the increasing content of the 131I the radioisotopes of 134, 137Cs were detected in the air. The maximum values of volumetric activity that registered in air for different radionuclides were observed on the 3rd and 4th of April were equal to 4.0mBq/m3 (131I); 1.04mBq/m3 (134Cs) and 1.15mBq/m3 (137Cs). In the Far East the maximum value of 131I activity was 2–4 times lower than that in the ETR and in the Asian territory of Russia (ATR) it was 2–8 times lower than that in the ETR. The 137Cs/134Cs ratio in the samples of atmospheric aerosols was close to one, which proved mainly the Fukushima origin of measured 137Cs.
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