福島第一原子力発電所事故により放射性テルルで汚染された白米の経口摂取による預託実効線量  [in Japanese] Committed Effective Dose from the Oral Ingestion of Radio-tellurium in Rice Released by the Fukushima Nuclear Power Plant Accident  [in Japanese]

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Author(s)

    • 藤原 慶子 FUJIWARA Keiko
    • 京都大学原子炉実験所放射線安全管理工学研究分野 Division of Radiation Safety and Control, Kyoto University Research Reactor Institute
    • 高橋 知之 TAKAHASHI Tomoyuki
    • 京都大学原子炉実験所放射線安全管理工学研究分野 Division of Radiation Safety and Control, Kyoto University Research Reactor Institute
    • 高橋 千太郎 TAKAHASHI Sentaro
    • 京都大学原子炉実験所放射線安全管理工学研究分野 Division of Radiation Safety and Control, Kyoto University Research Reactor Institute

Abstract

The accident at the Fukushima nuclear power plant in 2011 caused the release of large amounts of tellurium (Te) isotopes, with radio-cesium (Cs) and radio-iodine (I), into the environment. The total amounts of <sup>127m</sup>Te and <sup>129m</sup>Te released from the nuclear power plant were estimated as 1.1 × 10<sup>15</sup> and 3.3 × 10<sup>15</sup> Bq, respectively. At the location where the deposition of <sup>129m</sup>Te was relatively large, the ratio of the radioactivity of <sup>129m</sup>Te to that of <sup>137</sup>Cs reportedly reached 1.49 on June 14, 2011. Since <sup>127m</sup>Te has a relatively long half-life, it possibly contributed to the internal radiation dose at the early stage after the accident. In this paper, the ratio of the committed effective dose of <sup>127m</sup>Te to that of <sup>137</sup>Cs after the oral ingestion of rice was estimated by using various reported parameters. The relevant parameters are: 1) the deposition ratios of <sup>127m</sup>Te, <sup>129m</sup>Te, and <sup>134</sup>Cs to <sup>137</sup>Cs; 2) the deposition ratio of <sup>127m</sup>Te to <sup>129m</sup>Te; 3) the transfer factors of Te and Cs; and 4) the effective dose coefficients for <sup>127m</sup>Te, <sup>129m</sup>Te, <sup>134</sup>Cs, and <sup>137</sup>Cs. The ratios of the committed effective dose of <sup>127m</sup>Te to that of <sup>137</sup>Cs were calculated for adults after a single ingestion at the time of the rice harvest. The ratio was 0.45 where the <sup>129m</sup>Te/<sup>137</sup>Cs in the soil was higher and 0.05 where the level of <sup>129m</sup>Te/<sup>137</sup>Cs was average. The ratio of the committed effective dose from <sup>129m</sup>Te and <sup>127m</sup>Te to that from <sup>137</sup>Cs for one year reached 0.55 and 9.03 at the location where the level of <sup>129m</sup>Te/<sup>137</sup>Cs in the soil was higher. These data could indicate that radioactive Te should not be disregarded in reconstructing the internal radiation dose from food for one year after the accident.

Journal

  • Japanese Journal of Health Physics

    Japanese Journal of Health Physics 51(1), 19-26, 2016

    Japan Health Physics Society

Codes

  • NII Article ID (NAID)
    130005163109
  • NII NACSIS-CAT ID (NCID)
    AN00228458
  • Text Lang
    JPN
  • ISSN
    0367-6110
  • NDL Article ID
    027440787
  • NDL Call No.
    Z16-696
  • Data Source
    NDL  J-STAGE 
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