Study for shielding efficiency of evacuation facilities in nuclear emergency

Oguri, Tomomi*; Takahara, Shogo  ; Kimura, Masanori ; Homma, Toshimitsu

Sheltering is one of the protective actions in a nuclear emergency. To introduce the actions with effect, preparedness is needed from a point of efficiency of reduction of radiation exposure and also capacity and location. In this study, we surveyed building materials and construction of real facilities listed in prefectural regional emergency prevention plans and then evaluated the shielding efficiency of these facilities for external exposure. As the results, we obtained knowledge of distribution of shielding factor for actual evacuation facilities by cloudshine and groundshine. Moreover, based on the sensitivity analyses, basic data was obtained that easily evaluate the shielding efficiency of facilities with different structures and materials from basic building models.