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論文

Summary of temporal changes in air dose rates and radionuclide deposition densities in the 80 km zone over five years after the Fukushima Nuclear Power Plant accident

斎藤 公明; 三上 智; 安藤 真樹; 松田 規宏; 木名瀬 栄; 津田 修一; 吉田 忠義; 佐藤 哲朗*; 関 暁之; 山本 英明*; et al.

Journal of Environmental Radioactivity, 210, p.105878_1 - 105878_12, 2019/12

 被引用回数:7 パーセンタイル:17.93(Environmental Sciences)

We summarized temporal changes in air dose rates and radionuclide deposition densities over five years in the 80 km zone based on large-scale environmental monitoring data obtained continuously after the Fukushima Nuclear Power Plant (NPP) accident. The air dose rates in environments associated with human lives decreased at a considerably faster rate than expected for radioactive decay. The average air dose rate originating from the radiocesium deposited in the 80 km zone was lower than that predicted from radioactive decay by a factor of 2-3 at five years after the accident. The causes of this rapid reduction were discussed quantitatively considering the characteristics of radiocesium migration in the environment.

口頭

Temporal change of environmental contamination conditions in five years after the Fukushima accident

斎藤 公明

no journal, , 

The temporal change of environmental contamination conditions after the Fukushima accident have been clarified based on large-scale environmental monitoring data repeatedly obtained in the 80 km zone. The decreasing tendency of air dose rates was confirmed to obviously depend on land uses. In human-related diverse environments the air dose rates have decreased much faster than the physical decay of radiocesium. The horizontal movement of radiocesium in undisturbed fields were found to be generally quite small, though it has gradually penetrated into the deeper parts of the ground.

口頭

Temporal change in radiological environments for five years after the Fukushima accident

斎藤 公明

no journal, , 

Temporal change in radiological environments for five years after the Fukushima accident has been clarified on the basis of the large-scale environmental measurements repeatedly carried. Air dose rates in living environments have decreased much faster than the physical decay. A prediction model for air dose rate distribution has been developed according to statistical analyses of accumulated massive car-borne survey data. In June 2011 plural radionuclides were detected; while, radiocesium was found to be far more important than other radionuclides from a viewpoint of long-term exposure. The movement of radiocesium in horizontal directions in natural fields is generally slow, but radiocesium deposited on ground has gradually penetrated into deeper parts. The results obtained in the projects have been applied to different kinds of extensive analyses. Significant exposure doses to inhabitants have not been reported so far though further investigation is necessary.

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