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Development and application of the 3D Air Dose Rate Evaluation System (3DADRES)

Kim, M.; Malins, A. ; 町田 昌彦; 斎藤 公明; 長谷川 幸弘*; 柳 秀明*

Kim, M.; Malins, A.; Machida, Masahiko; Saito, Kimiaki; Hasegawa, Yukihiro*; Yanagi, Hideaki*

A priority after nuclear accidents is reducing radiation exposures for people living in long-term contaminated areas. An important contributor to radiation doses is external exposure to gamma rays from radioactive $$^{134}$$Cs and $$^{137}$$Cs. External exposure levels depend on the amount and distribution of $$^{134}$$Cs and $$^{137}$$Cs in the environment, the attenuation of gamma rays by matter, and the characteristic locations where people tend to spend time during their daily lives. Understanding and minimizing radiation exposures therefore requires good models connecting the distribution of $$^{134}$$Cs and $$^{137}$$Cs in the environment with gamma radiation dose rates in the air. The 3D Air Dose Rate Evaluation System (3D-ADRES) was developed in response to this issue. The main application of 3D-ADRES is for creating 3D models of locations in Fukushima Prefecture which are suitable Particle and Heavy Ion Transport code System (PHITS) radiation transport simulations. 3D-ADRES takes remote sensing data, such as satellite and aerial orthophotos, and digital elevation and surface models (DEM & DSM), and presents users with an interface for creating multi-faceted models of target sites. DEM data are used for creating a topographic model of the land surface. DSM data and the orthophotos are used for adding buildings and trees to the model, and for classifying different types of land surface, e.g. paved, soil and forest areas. Users are then able to set flexibly the amount of $$^{134}$$Cs and $$^{137}$$Cs within different areas and objects in the model.

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