期刊
JOURNAL OF NUCLEAR SCIENCE AND TECHNOLOGY
卷 54, 期 4, 页码 452-458出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/00223131.2017.1287602
关键词
Downward migration; forest soils; cesium 137; spatial variation; accident; adsorption
资金
- JSPS KAKENHI [15J03548]
- Phoenix Leader Education Program (Hiroshima Initiative) for Renaissance from Radiation Disaster, Organization of the Leading Graduate Education Program
- Grants-in-Aid for Scientific Research [15J03548] Funding Source: KAKEN
Downward migration of Cs-137 in soils was studied in three mixed deciduous forests c.a. 40 km northwest of the Fukushima Daiichi Nuclear power plant (FDNPP), Japan. We selected three different types of forest regarding to environmental condition such as slope inclinations and snow coverage conditions at the time of deposition. We examined temporal changes in the vertical distribution of Cs-137 from litter layers to 10 cm soil depth for two years (2.3 to 4.3 years after the FDNPP accident in 2011). At all three study sites, the Cs-137 in the litter layer had largely migrated to surface soil by 2013. After 2014, about 80% of the Cs-137 in forest soils (litter layer to 10 cm soil depth) remained within 0-5 cm soil layer. The vertical distribution had not changed substantially since 2014, suggesting that changes to the downward migration rates of Cs-137 in soils drastically decreased with time. In addition, small amounts of migrating Cs-137 could not be detected by the present method because there was a large spatial variation in the distribution of soil Cs-137. The results showed similar patterns of soil Cs-137 distribution among the three study sites although there were differences in the environmental conditions.
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