title: Measurement and estimation of radiocesium discharge rate from paddy field during land preparation and mid-summer drainage.
abstract: In this research, we evaluated the range of (137)Cs discharge rates from paddy fields during land preparation and mid-summer drainage. First, we investigated (137)Cs discharge loads during land preparation and mid-summer drainage and their ratio to the (137)Cs inventory of paddy field soil. We found that total discharge rates were 0.003-0.028% during land preparation and 0.001-0.011% during mid-summer drainage. Next, we validated the range of obtained total discharge of (137)Cs from the paddy fields using a simplified equation and literature review. As a result, we conclude that the range of total outflow loads of suspended solids for the investigated paddy field was generally representative of paddy fields in Japan. Moreover, the (137)Cs discharge ratio had a wide range, but was extremely small relative to (137)Cs present in paddy field soil before irrigation.
authors.affiliation: National Institute for Rural Engineering, National Agriculture and Food Research Organization, 2-1-6 Kannondai, Tsukuba, Ibaraki 305-8609, Japan.
authors.forename: Susumu
authors.initials: S
authors.lastname: Miyazu
authors.affiliation: National Institute of Advanced Industrial Science and Technology, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8567, Japan. Electronic address: t.yasutaka@aist.go.jp.
authors.forename: Tetsuo
authors.initials: T
authors.lastname: Yasutaka
authors.affiliation: Institute of Science and Technology, Niigata University, 8050 Ikarashi 2-no-cho, Nishi-ku, Niigata 950-2181, Japan.
authors.forename: Natsuki
authors.initials: N
authors.lastname: Yoshikawa
authors.affiliation: Narusawa Consultant Co., Ltd., 1-21-11 Amigawara, Chuo-ku, Niigata-city, Niigata prefecture 950-0964, Japan.
authors.forename: Shouhei
authors.initials: S
authors.lastname: Tamaki
authors.affiliation: Graduate School of Science and Technology, Niigata University, 8050 Ikarashi 2-no-cho, Nishi-ku, Niigata 950-2181, Japan.
authors.forename: Kousei
authors.initials: K
authors.lastname: Nakajima
authors.affiliation: School of Engineering, Tohoku University, 6-6 Aza-Aoba, Aramaki, Aoba-ku, Sendai-city, Miyagi prefecture 980-8579, Japan.
authors.forename: Iku
authors.initials: I
authors.lastname: Sato
authors.affiliation: Institute of Science and Technology, Niigata University, 8050 Ikarashi 2-no-cho, Nishi-ku, Niigata 950-2181, Japan.
authors.forename: Masanori
authors.initials: M
authors.lastname: Nonaka
authors.affiliation: Institute of Science and Technology, Niigata University, 8050 Ikarashi 2-no-cho, Nishi-ku, Niigata 950-2181, Japan.
authors.forename: Naoki
authors.initials: N
authors.lastname: Harada
mesh_terms: D000383:Agriculture / Q000379:methods*; D002588:Cesium Radioisotopes / Q000032:analysis*; D062406:Fukushima Nuclear Accident; D007564:Japan; D012275:Oryza; D011834:Radiation Monitoring; D012990:Soil Pollutants, Radioactive / Q000032:analysis*
chemical_list: D002588:Cesium Radioisotopes; D012990:Soil Pollutants, Radioactive
keywords: Drainage water; Land preparation; Mid-summer drainage; Outflow load; Paddy field; Radiocesium