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Soil removal as a decontamination practice and radiocesium accumulation in tadpoles in rice paddies at Fukushima.

Authors
  • Sakai, Masaru1
  • Gomi, Takashi2
  • Nunokawa, Masanori3
  • Wakahara, Taeko4
  • Onda, Yuichi5
  • 1 Institute of Agriculture, Tokyo University of Agriculture and Technology, 3-5-8 Saiwai-cho, Fuchu, Tokyo 183-8509, Japan. Electronic address: [email protected] , (Japan)
  • 2 Institute of Agriculture, Tokyo University of Agriculture and Technology, 3-5-8 Saiwai-cho, Fuchu, Tokyo 183-8509, Japan. Electronic address: [email protected] , (Japan)
  • 3 Graduate School of Agriculture, Hokkaido University, Kita-9jo, Nishi-9cho-me, Kita-ku, Sapporo city, Hokkaido 060-8589, Japan. Electronic address: [email protected] , (Japan)
  • 4 Institute of Agriculture, Tokyo University of Agriculture and Technology, 3-5-8 Saiwai-cho, Fuchu, Tokyo 183-8509, Japan. Electronic address: [email protected] , (Japan)
  • 5 Center for Research in Isotopes and Environmental Dynamics, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8572, Japan. Electronic address: [email protected] , (Japan)
Type
Published Article
Journal
Environmental pollution (Barking, Essex : 1987)
Publication Date
Apr 01, 2014
Volume
187
Pages
112–115
Identifiers
DOI: 10.1016/j.envpol.2014.01.002
PMID: 24463474
Source
Medline
Keywords
License
Unknown

Abstract

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.

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