NIRS’s Project for the Reconstruction of Early Internal Dose to Inhabitants in Fukushima After the Nuclear Disaster

In 2012, National Institute of Radiological Sciences (NIRS) launched a project on the reconstruction of the early internal dose, namely the thyroid dose to inhabitants in Fukushima and adjacent prefectures from the intake of short-lived nuclides, mainly 131I after the nuclear disaster. Limited human measurements make it difficult to estimate individual doses, and thus it is necessary to collect all information available and explore possible methods for dose reconstruction. As the first action of the project, a symposium was organized by NIRS on 10–11 July 2012. This chapter provides human or environmental measurement data collected and describes the current status of the project.