Abstract
This article provides the data which were analyzed in the research article "Different factors determine (137)Cs concentration factors of freshwater fish and aquatic organisms in lake and river ecosystems" (Y. Ishii, S. S. Matsuzaki, S. Hayashi, 2019) [1]. Radionuclide accumulation in aquatic organism is defined in terms of the concentration factor (CF), which is calculated as the radionuclide concentration in the organism (Bq kg(-1)) divided by that in the surrounding water (Bq L(-1)). Quantification of the radionuclide CF allows estimation of environmental radionuclide transfer and the potential risks of consuming fish contaminated with the radionuclide. We calculated the (137)Cs CF values for freshwater fish and aquatic organisms using the monitoring data of multiple sites in five rivers and three lakes of Fukushima in years 2013-2017 after the Fukushima Dai-ichi Nuclear Power Plant accident. The data also include the (137)Cs activity concentration of the water and water chemistry data (pH, biochemical oxygen demand, chemical oxygen demand, dissolved oxygen, electric conductivity, salinity, total organic carbon, suspended solid concentration, turbidity) at each sampling location associated with each CF value.