Abstract
This study aimed to reveal the detailed in-building radiation dose rate before and after the decontamination, and to examine the mitigation measures of the spatial radiation dose rate. It turned out that 1) as we measured the change of the spatial radiation dose rates inside and outside of general houses in Fukushima prefecture upon the decontamination operation, and clarified the association between the contamination of the external environment and in-building spatial radiation dose rate. Moreover, 2) we examined the radiation shielding factors of building components for houses, and it was revealed that the shielding factor ratio increases logarithmically as the wall becomes thicker, and we clarified how to apply shielding building materials to actual buildings.
