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Nomura, Naoki*; Arai, Hirotsugu*; Kuramoto, Takayuki*; Niizato, Tadafumi; Hayashi, Seiji*
no journal, ,
Wildfire in the mountainous forest of Fukushima, approximately 11 km west-north of the Fukushima Dai-ichi Nuclear Power Plant, burned 75 ha, which was occurred on 29th April and extinguished on 10th May 2017. In this study, we estimate the burning temperature and radiocesium elution characteristics of the residual carbides based on the thermal analysis and the dissolution test for the samples collected at the site of the wildfire to assess the impact of the wildfire on the radiocesium outflow.
Ishii, Yasuo; Muto, Kotomi; Hagiwara, Hiroki; Ito, Shoichi*; Takahashi, Makoto*; Tagomori, Hisaya; Dohi, Terumi; Kitamura, Akihiro
no journal, ,
A forest fire broke out on 29 April, 2017 in the Mount-Juman that straddles the Namie-city and Futaba-city in Fukushima Prefecture. The fire was extinguished on 10 May, 2017. In this period, atmospheric particle matters have been collected by Radiation Monitoring Unit Fukushima Prefectural Government in neighboring region. In this study we performed chemical analysis of the atmospheric particle matters and investigated the origination.
Niizato, Tadafumi; Sasaki, Yoshito; Watanabe, Takayoshi; Mitachi, Katsuaki*; Ito, Satomi; Kuramoto, Takayuki*; Arai, Hirotsugu*; Nomura, Naoki*; Hayashi, Seiji*; Tamaoki, Masanori*
no journal, ,
Cs released from the TEPCO's Fukushima Dai-ichi Nuclear Power Plant accident has a long half-life of about 30 years, it is necessary to monitor the distribution and its radioecological impact over the long term. Mountainous forests, which accounts for about 70% of Fukushima prefecture, tend to be a sink of radiocesium contamination rather than a source for the contamination of other ecosystems. An understanding of the environmental dynamics of radiocesium in the forest floor of various conditions is important issue, while progressing to the resident return. In this paper, we report on the results of the field investigation into the Cs distribution and the Cs outflow in the mountainous forest of Fukushima, where the wildfire broke out in the spring of 2017.
Nomura, Naoki*; Arai, Hirotsugu*; Kuramoto, Takayuki*; Niizato, Tadafumi; Hayashi, Seiji*
no journal, ,
In 2017, a wildfire occurred in mountainous forest of Namie Town, Fukushima Prefecture, where is designated as a difficult-to-return zone due to high radiation dose after TEPCO's Fukushima Daiichi Nuclear Power Plant accident. With the wildfire, changes of dynamics of radionuclide, especially Cs-137 was concerned. In this study, we focused residual charcoal to estimate burning temperature of surface soil and litter because it affects the dissolution behavior of nutrients and radiocesium in soil and litter on the forest floor of the burnt area. As a result of the wildfire, Japanese cedar forest and mixed forest with predominance of Japanese red pine and Japanese oak were burned, so we set up three control sites at each forest and collected the residual charcoals from burnt sites nearby unburnt locations. To clarify the carbonized temperature of residual charcoal, thermal analysis by TG-DTA and infrared adsorption spectrum analysis by micro-FTIR were conducted for litters, artificially burnt litters, and residual charcoals.
Niizato, Tadafumi; Arai, Hirotsugu*; Hayashi, Seiji*
no journal, ,
The inventory of Cs-137 on the forest floor suffered from the wildfire in the Juman-yama region show no clear difference between the burnt and unburnt areas. The monitoring results of Cs-137 outflow from the mountain slope show high outflow rate one year after the wildfire, but restoration of forest floor cover results in the lower outflow rate next year after the wildfire.