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The CsMPs were identified by autoradiography and subsequently were separated from other suspended particles by the “multiple wet separation method” using a NaI scintillation counter. The present four CsMPs contained 0.426–2.827 Bq of <sup>137</sup>Cs and had a chemical composition similar to that of particles released during the accident at the Fukushima Daiichi Nuclear Power Plant (FDNPP). The activity ratio of Cs (<sup>134</sup>Cs/<sup>137</sup>Cs) suggests that they originated from Unit 2 or 3 of the FDNPP. The ratio of the radioactivity of the separated CsMPs to the total radiocesium on the filters ranged from 0 to 46%. Moreover, we calculated the radioactivities of CsMPs with lower radioactivity (0.1 to 0.4 Bq <sup>137</sup>Cs) determined by autoradiography. When smaller CsMPs were included, the ratio of the radioactivity of the CsMPs to the total radioactivity of radiocesium on the filters ranged from 1.3 to 67%. It has been previously suggested that the solid-water distribution coefficient (<i>K</i><sub>d</sub>) of radiocesium in rivers is apparently increased due to the possible presence of CsMPs in the solid phase because the water solubility of radiocesium in CsMPs is small. However, this study reveals that higher <i>K</i><sub>d</sub> values in rivers in Fukushima compared with those in Chernobyl cannot be explained by the contribution of CsMPs alone. The temporal variation of the ratio of radioactivity of CsMPs to the total radioactivity of radiocesium in river water after the FDNPP accident is also discussed.</p>"}],"abstractLicenseFlag":"disallow"}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1410282679528840453","@type":"Researcher","personIdentifier":[{"@type":"NRID","@value":"9000388515019"}],"foaf:name":[{"@language":"en","@value":"Miura Hikaru"}],"jpcoar:affiliationName":[{"@language":"en","@value":"Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo"}]},{"@id":"https://cir.nii.ac.jp/crid/1410282679528840450","@type":"Researcher","personIdentifier":[{"@type":"NRID","@value":"9000388515020"}],"foaf:name":[{"@language":"en","@value":"Kurihara Yuichi"}],"jpcoar:affiliationName":[{"@language":"en","@value":"Department of Earth and Planetary Science, Graduate School of Science, The University of 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