2019年3月
Effects of radiocesium fixation potentials on Cs-137 retention in volcanic soil profiles of Fukushima forests
JOURNAL OF ENVIRONMENTAL RADIOACTIVITY
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- 巻
- 198
- 号
- 開始ページ
- 126
- 終了ページ
- 134
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1016/j.jenvrad.2018.12.025
- 出版者・発行元
- ELSEVIER SCI LTD
Radiocesium is well-known to be stabilized by clay minerals in soils, while volcanic soils could typically be poor in micaceous clays that fix Cs-137 effectively. We investigated Cs-137 fixation potentials [radiocesium interception potential (RIP)] and depth distribution of Cs-137 stocks in volcanic soils to analyze effects of clay content and mineralogy on soil retention and migration of Cs-137 after the Fukushima nuclear accident. Clay minerals of the volcanic soils were dominated by hydroxy-interlayered vermiculite (HIV) and short-range-order minerals, irrespective of bedrocks. The soil RIPs were positively correlated with mass of clay fraction among the HIV-dominated volcanic soils, but RIP per clay content in the HIV-dominated volcanic soils were lower than in the soils rich in illite or vermiculitic clays. The small RIPs in the organic horizons resulted in rapid Cs-137 migration from the organic horizons and their accumulation in the upper 0-5 cm mineral soil. Although RIPs of the studied volcanic soils fall within the lower class among major soil types, vertical Cs-137 migration in the mineral soil is small unless RIP is less than 300-400 mmol kg(-1) due to the low clay contents and shortage of illite or vermiculite.
- リンク情報
- ID情報
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- DOI : 10.1016/j.jenvrad.2018.12.025
- ISSN : 0265-931X
- eISSN : 1879-1700
- Web of Science ID : WOS:000457667600013