Time- and Position Dependence in Fukushima Prefecture of Air Dose Rate of Cs-origin due to the Accident at the Fukushima Daiichi Nuclear Power Plant

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  • 福島第一原発事故が及ぼしたセシウム起源空間放射線量率の福島県における経時変化と場所依存性
  • フクシマ ダイイチ ゲンパツ ジコ ガ オヨボシタ セシウム キゲン クウカン ホウシャセンリョウリツ ノ フクシマケン ニ オケル ケイジ ヘンカ ト バショ イソンセイ

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Abstract

After the emission of radioactive plumes from the Fukushima Daiichi Nuclear Power Plant in mid March, 2011, predominantly Cs nuclei have been responsible for radiation doses since June. The data of air dose rates at 155 points in central and eastern Fukushima prefecture acquired by the central and local governments through the period of June 10th and December 5th are analyzed to investigate their temporal and spatial variations. The calculated average rate of reduction is 22±2%, being twice as large as 11%, which is based on the radioactive decay process of 134Cs and 137Cs during the same period. Therefore, weathering effects are found comparable to those of radioactive decay. Owing to the strong weathering effects, the reduction rate of air dose rate tends to depend on the season. It is also found that some areas are still being contaminated through principally westward winds blowing from more contaminated areas like central-Namie and its vicinity.

Journal

  • RADIOISOTOPES

    RADIOISOTOPES 61 (7), 373-378, 2012

    Japan Radioisotope Association

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