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The paper presents the results of a comprehensive analysis of bottom sediment samples taken in 2020 during the Roshydromet marine scientific research in Stepovoi and Litke bays of the Novaya Zemlya archipelago and in the coastal zone of the Kara Sea near Amderma village. All sediment samples were analyzed for the concentration of radionuclides 137Cs, 90Sr, 238Pu, 239 + 240Pu, and some samples were analyzed for the content of toxic chemicals: heavy metals, persistent organochlorine compounds, and aliphatic hydrocarbons. The analysis of the results showed that the levels of radionuclides and toxic chemicals in bottom sediments of Stepovoi Bay are generally consistent with the data of similar surveys in previous years. [ABSTRACT FROM AUTHOR]

The radiation conditions in Moscow and the Moscow region are assessed using observations at the Roshydromet radiation monitoring network. The paper presents the dynamics of the radiation background caused by technogenic radionuclides in the environment, starting from the period of nuclear tests in the atmosphere to the present. A comparative analysis is provided for the radiation characteristics in Moscow and the Moscow region, in different regions of the center of European Russia, and in the background areas during the period of the most significant radiation events in the recent decades: the accidents at Chernobyl in 1986, Fukushima in 2011, and an incident in Elektrostal in 2013. [ABSTRACT FROM AUTHOR]