Gerald Kirchner

TL;DR: The IAEA has published materials aimed at supporting the assessment of radiation impacts on human beings and the environment as discussed by the authors, including two major publications, Sediment Kd======¯¯¯¯s and Concentration Factors for Radionuclides in the Marine Environment (Technical Reports Series No. 247), published in 1985, and the Handbook of Parameter Values for the Prediction of radionuclide (Transfer in Temperate Environments) published in 1994, together provided a full set of available transfer parameter values for the marine, freshwater and terrestrial environments.

TL;DR: The effects of competition with major ions present in the soil-plant system, the effects of rhizosphere processes and soil micro-organisms on bioavailability, the factors influencing transport to and uptake by roots and the processes affecting long-term uptake rates are reviewed.

TL;DR: The convective-dispersive transport and linear sorption model is discussed for the vertical migration of radionuclides in soil and its resulting model parameters, apparent convection velocity v and apparent dispersion constant D, indicate that v and D are not mere fitting parameters, but can be given a real physical interpretation.

TL;DR: By example of undisturbed soils and marine water bodies it is shown that the ecological half-life concept is questionable if the distribution of the radionuclide of interest within the medium studied is non-uniform and if mixing and transport processes within this medium are of considerable importance during the time period of observation.

TL;DR: It is shown that for various sedimentation regimes additional information from other sources may be needed to establish a reliable chronology and a strategy for sediment dating using (210)Pb is recommended.