Journal Article 長崎に飛来する大気中浮遊物質に含まれる原発事故由来放射性物質と天然放射性物質、安定元素

高辻, 俊宏  ,  袁, 軍  ,  世良, 耕一郎

21pp.146 - 152 , 2016-01 , 日本アイソトープ協会
134,137Cs due to the Fukushima Daiichi Nuclear Power Plant accident were repeatedly detected in aerosols in the atmosphere of Nagasaki, over 1,000 km distant from the power plant, between March 2011 and December 2014. Air trajectory analysis showed a direct trajectory from the nuclear power plant to Nagasaki at the first arrival of 134,137Cs. However, the direct trajectories were rarely shown at the subsequent arrivals. Alternatively, many trajectories mainly passed through land areas including Korean Peninsula when the concentrations of 137Cs were high. We now have measured concentrations of stable elements in the aerosols with PIXE analysis and found negative correlation between 137Cs and stable Na concentrations, and positive correlation between 137Cs and S, Ni, V. Na is thought to be mainly due to sea salt in the aerosols. S, Ni and V are considered mainly emitted from the combustion of fossil fuels in land area. The results suggest that 134,137Cs were refloated from land surfaces distant from the nuclear power plants and transported to Nagasaki. We collected mosses on road and open parking of many places in Japan. Almost samples contain measurable amount of 137Cs and most of the samples contain measurable amount of 134Cs including samples of Sapporo Hokkaido and Nagasaki, most distant places from the nuclear power plants in Japan. Therefore, it is clear that 134,137Cs due to the accident spread over almost of Japan with more or less concentrations and refloating of them is totally possible.

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