Changing of artificial radionuclide concentrations in atmospheric aerosols over Vladivostok after the Fukushima reactor accident
Artificial radionuclides, such as I-131, Cs-134 and Cs-137, as well as natural isotopes of Be-7 and K-40 have been registered in atmospheric aerosols over Vladivostok selected from March 11 till June 17, 2011. Artificial radionuclides were also discovered in atmospheric precipitations. From March 25 till April 15 increasing concentrations of atmospheric aerosols from 121 to 330 μg / m3 have been accompanied by hundred-fold increase in gamma-activity of Cs-134, Cs-137 and a bit smaller increase of I-131 as a part of aerosols. Variability of gamma activity of natural isotopes of Be-7 and K-40 is not greater than one order magnitude throughout the sampling period. Synoptic analysis of back trajectories motion of air masses showed that the radioactive cloud came to the south of Primorsky Territory from the regions of Siberia and North-Eastern part of China.