Abstract
Total radioactivity of 137Cs in water samples from the Niida River was 0.025–4.18 Bq/L during May 2011–November 2012. Higher radioactivity was found during May–September 2011 and after a high flow condition caused by a rain event in 2012. The particulate phase of 134Cs and 137Cs was 47–48 % for May–September 2011, 75–93 % in normal flow conditions and 86–91 % in high flow conditions after December 2011. These results indicate that the supply of 134Cs and 137Cs from the watershed differs from the early stage up to September 2011 and from the last stage.
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