This publication provides data for use in assessments of routine discharges of radionuclides to terrestrial and freshwater environments. Some of the data may also be useful for assessing the impacts of accidental releases and releases in the future. The report provides information on radionuclides and on processes to be taken into account in assessments of the radiation impact of radionuclide discharges to terrestrial and freshwater ecosystems. The data collected here are relevant to the transfer of radionuclides through food chains to humans; while radionuclide transfers to non-human species are not specifically addressed, in many situations the data are also applicable for assessments of such transfers. Although the data primarily relate to equilibrium conditions — that is, conditions where equilibrium has been established between movements of radionuclides into and out of compartments of the environment — some data relevant to time dependent radionuclide transfer in the environment are also included.