The activity concentrations and concentration factors of radio-cesium 137 (<sup>137</sup>Cs) in chironomid larvae in Lake Kasumigaura two years after the Fukushima Accident

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  • SATAKE Kiyoshi
    Center for Environmental Biology and Ecosystem Studies, National Institute for Environmental Studies
  • UENO Ryuhei
    Center for Environmental Biology and Ecosystem Studies, National Institute for Environmental Studies
  • MATSUZAKI Shin-ichiro S.
    Center for Environmental Biology and Ecosystem Studies, National Institute for Environmental Studies
  • TANAKA Atsushi
    Center for Environmental Measurement and Analysis, National Institute for Environmental Studies
  • KOHZU Ayato
    Center for Regional Environmental Research, National Institute for Environmental Studies
  • NAKAGAWA Megumi
    Center for Environmental Biology and Ecosystem Studies, National Institute for Environmental Studies
  • NOHARA Seiichi
    Center for Environmental Biology and Ecosystem Studies, National Institute for Environmental Studies

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Other Title
  • 福島原発事故から2年後の霞ヶ浦におけるユスリカ幼虫の放射性セシウム137（<sup>137</sup>Cs）の濃度と移行状況
  • 福島原発事故から2年後の霞ヶ浦におけるユスリカ幼虫の放射性セシウム137(¹³⁷Cs)の濃度と移行状況
  • フクシマ ゲンパツ ジコ カラ 2ネンゴ ノ カスミガウラ ニ オケル ユスリカ ヨウチュウ ノ ホウシャセイ セシウム 137(¹ ³ ⁷ Cs)ノ ノウド ト イコウジョウキョウ
  • The activity concentrations and concentration factors of radio-cesium 137 (137Cs) in chironomid larvae in Lake Kasumigaura two years after the Fukushima Accident

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Abstract

<p>　Approximately two years after the accident at the Fukushima Daiichi Nuclear Power Plant on 11 March 2011, radiocesium (137Cs) concentrations were measured from lake water and benthic macroinvertebrate (mainly composed of chironomid larvae: Chironomus plumosus and Tanypus nakazatoi) samples from the three stations in pelagic zone of Lake Kasumigaura. The larvae of C. plumosus were collected in sufficient numbers at the three stations, whereas the larvae of T. nakazatoi were collected in sufficient numbers at Tsuchiura-iri only. We determined the difference in the activity concentrations of 137Cs in chironomid larvae between the two species and among the three stations, and calculated their concentration factors (CF). The activity concentration of 137Cs in T. nakazatoi (12.3 Bq kg-1) was within the range of that observed in C. plumosus (5.5 – 20.7 Bq kg-1). The activity concentration of 137Cs of T. nakazatoi was lower than that of C. plumosus at Tsuchiura-iri. The concentration factors of T. nakazatoi and C. plumosus were 630 and 380 – 1060, respectively.</p>

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