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The presence of radionuclides at five water purification plants was investigated after an explosion at a nuclear power plant hit by the Great East Japan Earthquake on 11 March 2011. Radioactive iodine ( 131 I) and cesium ( 134 Cs and 137 Cs) were detected in raw water in Fukushima and neighboring prefectures. 131 I was not removed by coagulation–flocculation–sedimentation...
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