Vertical <sup>137</sup>Cs distribution in the bark of Japanese cedar trees in 2012 after the Fukushima Dai-ichi Nuclear Power Plant Accident

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  • Ogawa Hideki
    Fukushima Prefectural Forestry Research Centre
  • Yokota Kahori
    Graduate School of Urban Environmental Science, Tokyo Metropolitan University
  • Arai Shio
    Graduate School of Urban Environmental Science, Tokyo Metropolitan University
  • Sakurai Satoshi
    Graduate School of Urban Environmental Science, Tokyo Metropolitan University
  • Yoshida Hirohisa
    Graduate School of Urban Environmental Science, Tokyo Metropolitan University

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Other Title
  • 福島第一原子力発電所事故由来<sup>137</sup>Csによる2012年のスギ樹皮の垂直汚染分布
  • 福島第一原子力発電所事故由来¹³⁷Csによる2012年のスギ樹皮の垂直汚染分布
  • フクシマ ダイイチ ゲンシリョク ハツデンショ ジコ ユライ ¹ ³ ⁷ Cs ニ ヨル 2012ネン ノ スギ ジュヒ ノ スイチョク オセン ブンプ

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<p>Vertical 137Cs distribution in the barks of Japanese cedar (Cryptomeria japonica) trees in the initial phase after the Fukushima Dai-ichi Nuclear Power Plant accident was investigated in several forests in Fukushima prefecture in 2012. 12 trees that were felled in 7 forests were used in the present study. 137Cs concentration in bark samples taken at various heights were determined using a NaI spectrometer. In order to compare the vertical 137Cs distribution in the bark of each tree, 137Cs concentration was normalized to that at the lowest height from the ground. An increase of 137Cs concentration from the bottom to the tree top was clearly observed for 9 trees. The inner barks were almost constant at any vertical positions. Large part of the 137Cs in the barks existed in the outer barks. These results indicated that the vertical distribution of the outer 137Cs contamination on the barks in 2012 had a common 137Cs concentration profiles against the tree top with the different contamination levels of the forests and different height of the tree.</p>

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