Long-term dynamics of technogenic radionuclide concentrations in moss-lichen cover

Ample factual data has been used to analyze the long-term dynamics of ⁹⁰Sr and ¹³⁷Cs concentrations in moss-lichen cover. The stocks of radionuclides in lichens, mosses, and the moss-lichen cover of northern regions of the Urals and Siberia has been estimated for the first time. The data on recent ranges of ⁹⁰Sr and ¹³⁷Cs concentrations in lichens and mosses can serve as a basis for determining the background levels of radionuclide contamination for long-term monitoring and prognostic radioecological studies.