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Radiocesium fluxes in rivers across the Fukushima fallout region to 2015 and their controlling factors

福島県における河川を介した放射性セシウムの2015年までのフラックスとその支配要因

恩田 裕一*; 谷口 圭輔*; Smith, H.*; Blake, W.*; 吉村 和也

Onda, Yuichi*; Taniguchi, Keisuke*; Smith, H.*; Blake, W.*; Yoshimura, Kazuya

The monitoring started at 6 sites from June 2011. Subsequently, additional 24 monitoring sites were installed between October 2012 and January 2013. The total measured flux to the ocean of radiocesium from the Abukuma River at Iwanuma was 14 TBq for the period from August 2011 to October 2014. The transfer of radiocesium with suspended sediment declining until March 2015 and had high correlation with land cover ratio by different land use of the catchments. Also we found positive correlation with radiocesium flux and catchment landuses.

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