Haruyasu Nagai

TL;DR: In this article, the preliminary estimation of release amounts of 131I and 137Cs from the Fukushima Daiichi nuclear power plant into the atmosphere has been presented, with the aim to estimate the amount of radiation released by the plant.

TL;DR: The analysis of regional-scale atmospheric dispersion and deposition suggests that the present distribution of a large amount of (137)Cs deposition in eastern Japan was produced primarily by four events that occurred on March 12, 15-16, 20, and 21-23.

TL;DR: In this article, the authors estimate the detailed atmospheric releases during the Fukushima Daiichi nuclear power station (FNPS1) accident using a reverse estimation method which calculates the release rates of radionuclides by comparing measurements of air concentration of a radionside or its dose rate in the environment with the ones calculated by atmospheric and oceanic transport, dispersion and deposition models.

TL;DR: The simulation indicated that air dose rates significantly increased in the south-southwest region of FNPP1 by dry deposition of the high-concentration plume discharged from the night of March 14 to the morning of March 15.

TL;DR: Investigating vertical distributions of radiocesium and physicochemical properties in soils at 15 locations under different land-use types within a 2 km × 2 km mesh area in Fukushima city suggests that organic matter inhibits strong adsorption of (137)Cs on clay minerals in surface soil layers, and as a result affects the vertical distribution and thus the mobility of ( 137)Cs in soil, particularly in the forest ecosystems.