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The article focuses on the management of the relocation of people displaced due the destruction of the earthquake-driven tsunami in Japan. It mentions Ministerial Conference on Nuclear Safety by International Atomic Energy Agency for discussing the development of nuclear plants that would be secure. It mentions the management policy of Japan to reverse migratory flows.

The Fukushima nuclear accident inMarch 2011 generated a 3000 km² plume of soils heavily contaminated with 137Cs. Decontamination was completed early in 2019. Typhoon Hagibis was the first extreme event that occurred in the region after decontamination. Its impact on sediment sources and sediment 137Cs contamination was investigated through the application of a sediment fingerprinting procedure using spectrocolorimetry and geochemical properties. Sediment deposits (n = 24) were collected in the Mano and Niida River catchments after the 2019 typhoons, and their signature was compared to that of potential sources (e.g., cropland, forests, and subsurface; n = 57). Results demonstrate the dominance of cropland as the main source of sediment (mean: 54%) followed by forests (41%) with much lower contributions of subsurface material (5%). Overall, 137Cs concentrations in sedimentwere on average 84%--93%lower than the levels recorded after the accident in 2011, which demonstrates the effectiveness of cropland decontamination. [ABSTRACT FROM AUTHOR]