title: Time Dependence of the (137)Cs Concentration in Particles Discharged from Rice Paddies to Freshwater Bodies after the Fukushima Daiichi NPP Accident.
abstract: The concentration of particulate (137)Cs in paddy fields, which can be a major source of (137)Cs entering the water system, was studied following the Fukushima Daiichi Nuclear Power Plant accident. To parametrize the concentration and to estimate the time dependence, paddy fields covering various levels of (137)Cs deposition were investigated over the period 2011-2013 (n = 121). The particulate (137)Cs concentration (kBq kg-SS(-1)) showed a significant correlation with the initial surface deposition density (kBq m(-2)). This suggests that the entrainment coefficient (m(2) kg-SS(-1)), defined as the ratio between the particulate (137)Cs concentration and the initial surface deposition density, is an important parameter when modeling (137)Cs wash-off from paddy fields. The entrainment coefficient decreased with time following a double exponential function. The decrease rate constant of the entrainment coefficient was clearly higher than that reported for other land uses and for river water. The difference in the decrease rates of the entrainment coefficient suggests that paddy fields play a major role in radiocesium migration through the water system. An understanding of the decrease rate of the entrainment coefficient of paddy fields is therefore crucial to understand the migration of radiocesium in the water system.
authors.affiliation: Sector of Fukushima Research and Development, Japan Atomic Energy Agency, Sahei Building 8F 1-29, Okitama-cho, Fukushima-shi, Fukushima 960-8034, Japan.|Center for Research in Isotopes and Environmental Dynamics, University of Tsukuba , 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8572, Japan.
authors.forename: Kazuya
authors.initials: K
authors.lastname: Yoshimura
authors.affiliation: Center for Research in Isotopes and Environmental Dynamics, University of Tsukuba , 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8572, Japan.
authors.forename: Yuichi
authors.initials: Y
authors.lastname: Onda
authors.affiliation: Institute of Symbiotic Science and Technology, Tokyo University of Agriculture and Technology , 3-5-8, Saiwai-cho, Fuchu, Tokyo 183-8509, Japan.
authors.forename: Taeko
authors.initials: T
authors.lastname: Wakahara
mesh_terms: D002588:Cesium Radioisotopes / Q000032:analysis*; D004784:Environmental Monitoring; D005618:Fresh Water; D062406:Fukushima Nuclear Accident; D007564:Japan; D012275:Oryza; D011834:Radiation Monitoring; D012990:Soil Pollutants, Radioactive / Q000032:analysis; D013997:Time Factors; D014875:Water Pollutants, Radioactive / Q000032:analysis*
chemical_list: D002588:Cesium Radioisotopes; D012990:Soil Pollutants, Radioactive; D014875:Water Pollutants, Radioactive