Soil removal as a decontamination practice and radiocesium accumulation in tadpoles in rice paddies at Fukushima.
We investigated the biological accumulation of radiocesium in tadpoles [Rana (Pelophylax) porosa porosa] in rice paddies with and without decontamination practice at Fukushima. Radiocesium was accumulated in surface part of soils both in the control and decontaminated paddies one year after decontamination. Mean (134)Cs and (137)Cs concentrations in tadpoles in the control and decontaminated paddies were 3000 and 4500, and 600 and 890 Bq/kg dry weight, respectively. Radiocesium concentrations in surface soil (0-5 cm depth) and tadpoles in the decontaminated paddy were five times smaller than in the control paddy. These results suggest that decontamination practice can reduce radiocesium concentrations in both soil and tadpoles. However, at the decontaminated paddy, radiocesium concentrations in surface soils became 3.8 times greater one year after decontamination, which indicates that monitoring the subsequent movement of radiocesium in rice paddies and surrounding areas is essential for examining contamination propagation.
Institute of Agriculture, Tokyo University of Agriculture and Technology, 3-5-8 Saiwai-cho, Fuchu, Tokyo 183-8509, Japan. Electronic address: boundary.0008@gmail.com.
Masaru
M
Sakai
Institute of Agriculture, Tokyo University of Agriculture and Technology, 3-5-8 Saiwai-cho, Fuchu, Tokyo 183-8509, Japan. Electronic address: gomit@cc.tuat.ac.jp.
Takashi
T
Gomi
Graduate School of Agriculture, Hokkaido University, Kita-9jo, Nishi-9cho-me, Kita-ku, Sapporo city, Hokkaido 060-8589, Japan. Electronic address: noopoki@gmail.com.
Masanori
M
Nunokawa
Institute of Agriculture, Tokyo University of Agriculture and Technology, 3-5-8 Saiwai-cho, Fuchu, Tokyo 183-8509, Japan. Electronic address: amusel@cc.tuat.ac.jp.
Taeko
T
Wakahara
Center for Research in Isotopes and Environmental Dynamics, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8572, Japan. Electronic address: onda@geoenv.tsukuba.ac.jp.
Yuichi
Y
Onda
D000383:Agriculture; D000818:Animals; D002588:Cesium Radioisotopes / Q000032:analysis* / Q000378:metabolism; D003666:Decontamination / Q000379:methods; D052918:Environmental Restoration and Remediation / Q000379:methods*; D062406:Fukushima Nuclear Accident; D007564:Japan; D007814:Larva / Q000378:metabolism*; D012275:Oryza; D012987:Soil / Q000737:chemistry; D012990:Soil Pollutants, Radioactive / Q000032:analysis* / Q000378:metabolism; D014875:Water Pollutants, Radioactive / Q000032:analysis* / Q000378:metabolism
D002588:Cesium Radioisotopes; D012987:Soil; D012990:Soil Pollutants, Radioactive; D014875:Water Pollutants, Radioactive
Agricultural field; Nuclear power plant; Radiation contamination; Rana (Pelophylax) porosa poros; Wetland