Survey of Radioactive Contamination along Mt. Fujiʼs Climbing Routes Following TEPCOʼs Fukushima Daiichi Nuclear Power Plant Accident

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TEPCO’s Fukushima Daiichi Nuclear Power Plant (FDNPP) accident occurred in March 2011, and the resulting release of radioactive nuclides contaminated Mt. Fuji’s ground surface. It was of great concern that climbers would be at a risk of being exposed to elevated radiation levels at Mt. Fuji. In this study, dose rates in air (absorbed dose rates in air) were continuously measured while climbing along two popular climbing routes: the Yosida (Kawaguchiko) and Subashiri routes. The dose rates ranged from 15 to 24 nGy/h, which are less than the background level for terrestrial gamma rays in Japan (51 nGy/h). This study suggests that the deposition of artificial radioactive nuclides over the Mt. Fuji and its climbing routes has little effect on the increase of the dose rates in air.