Radionuclide contamination in flood sediment deposits in the coastal rivers draining the main radioactive pollution plume of Fukushima Prefecture, Japan (2011–2020)

Abstract. Artificial radionuclides including radiocesium (134Cs and 137Cs) radiosilver (110mAg) were released into the environment following Fukushima Dai-ichi nuclear power plant accident in March 2011. These particle-bound substances deposited on soils of north-eastern Japan, located predominantly within a ?3000 km2 radioactive fallout plume drained by several coastal rivers to Pacific Ocean. The current dataset (Evrard et al., 2021), which can be accessed at https://doi.org/10.1594/PANGAEA.928594, compiles gamma-emitting artificial radionuclide activities measured 782 sediment samples collected from 27 71 locations across catchments draining ?6450 during 16 fieldwork campaigns. campaigns conducted Japan between November 2011 2020 river main plume. This database may useful evaluate anticipate post-accidental redistribution for spatial validation models simulating transfer continental landscapes.