Abstract
During the early stages of the Fukushima nuclear accident, the temporal variations of 131I deposited on the ground and of 131I accumulated in cropland soil were monitored at a fixed location in Japan. Moreover, concentrations of long-lived radioactive iodine (129I) in atmospheric deposits and soil were measured to examine the feasibility of retrospectively reconstructing 131I levels from the levels of accident-derived 129I. The exceptionally high levels of 131I in deposits and soil were attributed to rainfall-related deposition of radionuclides. In the crop field studied, the losses of deposited 131I and 129I due to volatilization were small. The atomic ratio 129I/131I in the topsoil corresponded to the same ratio in deposits. The 131I concentrations measured in the topsoil were very consistent with the 131I concentrations reconstructed from the 129I concentrations in the soil.
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