Abstract
An understanding of the environmental dynamics of the radiocaesium released from Fukushima Daiichi Nuclear Power Plant is a crucial issue for remediation of the Fukushima environment because it is the main radionuclide which contributes to population dose within the contaminated area. This paper presents the research project of JAEA on the transport and depositional behavior of the radiocaesium in the Fukushima environments, such as forests, rivers, and dam lake.