Major Factors Affecting Weathering Half-lives of Iodine-131 and Radiocaesium in Leafy Vegetables Directly Contaminated by Fukushima Dai-ichi Nuclear Power Plant Accident Fallout (1) Calculating Weathering Half-lives of Leafy Vegetables Using Data Observed after the Fukushima Nuclear Accident

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  • Tagami Keiko
    National Institutes for Quantum and Radiological Science and Technology, Quantum Medical Science Directorate, National Institute of Radiological Sciences
  • Uchida Shigeo
    National Institutes for Quantum and Radiological Science and Technology, Quantum Medical Science Directorate, National Institute of Radiological Sciences

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Other Title
  • 東京電力福島第一原子力発電所事故由来のI-131及び放射性セシウムの葉菜類のウェザリング半減期の主要因に関する考察(1)実測値によるウェザリング半減期
  • トウキョウ デンリョク 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 ノ I-131 オヨビ ホウシャセイ セシウム ノ ヨウサイルイ ノ ウェザリング ハンゲンキ ノ シュヨウイン ニ カンスル コウサツ(1)ジッソクチ ニ ヨル ウェザリング ハンゲンキ

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Abstract

<p>Radioactivity-concentration decline rates from leafy vegetables after receiving direct deposition of radionuclides can be estimated using weathering half-life (Tw). However, Tw data for leafy vegetables observed under the field conditions are not reported yet. Therefore, we calculated Tw values for 131I and radiocaesium using our data for giant butterbur leaves, and also using vegetable data from food monitoring conducted by the Ministry of Health, Labour and Welfare; both were observed in March to April 2011, just after the occurrence of the Fukushima Dai-ichi Nuclear Power Plant Accident. The results showed that the geometric mean Tw values for 131I was 8.4 d, and for radiocaesium was 7.6 d; no significant difference was observed between Tw values of these radionuclides.</p>

Journal

  • RADIOISOTOPES

    RADIOISOTOPES 69 (11), 341-352, 2020-11-15

    Japan Radioisotope Association

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