Results of the program to develop guidelines for decontamination, 2; Demonstration project of decontamination at Shimo-oguni area in Date city

Sakai, Akihiro ; Amazawa, Hiroya; Nakata, Hisakazu ; Miyahara, Kaname  ; Kihara, Shinji

JAEA performed decontamination experiments at a test site (Shimo-oguni area) that combined a range of buildings and different types of land use, located in Date city as a field decontamination project in order to accumulate knowledge and data for full-scale decontamination. As a result of the decontamination that was performed using methods that can be easily implemented, taking into consideration the topography and land use of the target area, the average air dose rates were reduced to approximately one half of the values before decontamination. In addition, contamination state of residential house roofs showed a tendency for radiocesium to be concentrated at specific locations. It was confirmed that wiping or grinding with electric grinders, according to the contamination state, were effective means of decontaminating residential house roofs.