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The distribution and migration of artificial fallout radionuclides in natural soils has been profusely studied for assessing radioecological impacts and predicting their long-term behaviour, among other topics. Despite the standardized use of the analytical solutions of a simplified convection-diffusion equation (CDE), there are still some concerns and open questions. This work is aimed at contributing to the understanding of basic processes governing the distribution of fallout radionuclides in vegetated soils with rhizospheres. It studies 210Pb and 137Cs in soil cores and vegetal samples from Chréa National Park, in Algeria, along with other natural radionuclides and some major and trace elements. Results include surficial and depth distributions of radionuclide concentrations, and site and plant-specific concentration ratios (CR). Inventories of 137Cs (3620 ± 120 Bq m−2) and 210Pbexc (9000 ± 900 Bq m−2) in soils are typical from global fallout in high precipitation areas in the Northern Hemisphere. A simple model of a polyphasic soil, including rhizospheres, provides a realistic description in the studied case, where plant roots occupy about 45% of the volume in the 0–10 cm interval, with a high porosity around rhizomes. This composite soil matrix explains the different patterns observed in the depth distribution of the studied elements. The depth-distributions of 137Cs and 210Pbexc have been modelled with different approaches: i) analytical solution of the CDE with mean annual convection and large observation times; ii) as before, but with convection representing infiltration events and short observation times; iii) numerical modelling of the 137Cs profile in the mineral phase using CDE with fast initial distributions. The three approaches fit the empirical data, but they predict different time evolutions. The approach iii) provides a more realistic description. Results are questioning the common accepted analysis and its predictive use.

The sedimentary system of the Algiers Bay has been impacted in the last decades by the exponential increases in population, urbanism and industrial activities of the city of Algiers, and by episodic floods, mudflows, earthquakes and tsunamis. Activity concentrations of environmental gamma-emitters, namely 210Pb, 226Ra, 40K, 228Ra, 228Th and 137Cs, were measured in a sediment core sampled in 2015 at the central zone of this bay, at 73 m depth from the surface water. The 210Pb-based radiometric dating was challenging due to the incomplete recovery of the inventory, the absence of 137Cs peaks, and the failure of classical models. The analysis of clusters in the logarithmic plot of the excess 210Pb versus mass depth profile allowed for establishing a reliable chronology. Fluxes of excess 210Pb and sediment accumulation rates (SAR) have both varied over the last five decades. Recent SAR values are of 0.73 ± 0.21 g cm−2y−1. Major and trace elements were determined by X-Ray Fluorescence in some selected sediment slices. Moderate enrichments have been observed for Mn, Zn, Br, Rb, Sr, Y and Pb in the 0–1 cm sediment layer (when using Al as normalization element), being governed by Fe-rich carriers. The major impact is observed in the carbon content, which increased by two orders of magnitude (from their basal values) for three decades since early 70's. The dataset also allowed for a radioecological assessment in the area, performed using the ERICA software.