ダウンロード数: 238
このアイテムのファイル:
ファイル | 記述 | サイズ | フォーマット | |
---|---|---|---|---|
j.jenvrad.2018.06.020.pdf | 1.46 MB | Adobe PDF | 見る/開く |
タイトル: | Concentrations and biological half-life of radioactive cesium in epigeic earthworms after the Fukushima Dai-ichi Nuclear Power Plant accident |
著者: | Tanaka, Sota. Adati, Taro. Takahashi, Tomoyuki. Fujiwara, Keiko. Takahashi, Shuko |
著者名の別形: | 髙橋, 知之 藤原, 慶子 |
キーワード: | Waste Management and Disposal Pollution Health, Toxicology and Mutagenesis Environmental Chemistry General Medicine |
発行日: | Dec-2018 |
出版者: | Elsevier BV |
誌名: | Journal of Environmental Radioactivity |
巻: | 192 |
開始ページ: | 227 |
終了ページ: | 232 |
抄録: | To understand the long-term behavior of radiocesium in the biological processes of a forest ecosystem, its concentration in Japanese epigeic earthworms (Megascolecidae), litter, and soil, and the ambient dose equivalent rates, were investigated after the Fukushima Dai-ichi Nuclear Power Plant accident. The metabolism of radiocesium in the earthworms was also investigated in the laboratory, and its biological half-life (Tb) was estimated. The concentration of ¹³⁷Cs in the habitat soil and litter changed from 2014 to 2016, with levels in the litter going from 44.9 Bq/g dw (in 2014) to 45.3 Bq/g dw (2015) and 10.7 Bq/g dw (2016); in soil, these values were 9.79 Bq/g dw, 7.14 Bq/g dw and 18.0 Bq/g dw, respectively. By contrast, no significant changes were observed in the concentrations in the earthworms, which were 4.87 Bq/g fw, 5.30 Bq/g fw and 4.67 Bq/g fw in 2014, 2015, and 2016, respectively. The ambient dose equivalent rates at the sampling site declined significantly over these three years, going from 2.15 μSv/h to 1.68 μSv/h and 1.35 μSv/h, mostly corresponding to physical decay of radiocesium. The majority (95%) of the ¹³⁷Cs in the earthworms, observed via autoradiography, was concentrated primarily in the intestine. The clearance of ¹³⁷Cs from the earthworms was described by dual exponential functions: the half-life in the rapid loss due to gut clearance was 0.10 days and a second slower loss due to physiological clearance was 27.4 days. |
著作権等: | © 2018 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/BY-NC-ND/4.0/). |
URI: | http://hdl.handle.net/2433/234597 |
DOI(出版社版): | 10.1016/j.jenvrad.2018.06.020 |
PubMed ID: | 29986314 |
出現コレクション: | 学術雑誌掲載論文等 |
このリポジトリに保管されているアイテムはすべて著作権により保護されています。