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Quantitative evaluation of tritium transfer in the ground surface

Research Project

Project/Area Number 16360473
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Nuclear engineering
Research InstitutionNagoya University

Principal Investigator

YAMAZAWA Hiromi  Nagoya University, Graduate School of Engineering, Associate Professor, 大学院工学研究科, 助教授 (70345916)

Co-Investigator(Kenkyū-buntansha) IIDA Takao  Nagoya University, Graduate School of Engineering, Professor, 大学院工学研究科, 教授 (50089843)
MORIIZUMI Jun  Nagoya University, Graduate School of Engineering, Assistant Professor, 大学院工学研究科, 助手 (90303677)
NAGAI Haruyasu  Japan Atomic Energy Agency, Senior Researcher, 原子力基礎工学研究部門, 副主任研究員 (20354847)
ANDO Mariko  Japan Atomic Energy Agency, Senior Researcher, 原子力基礎工学研究部門, 副主任研究員 (20354855)
KOARASHI Jun  Japan Atomic Energy Agency, Researcher, 放射線管理部門, 研究員 (30421697)
Project Period (FY) 2004 – 2006
Project Status Completed (Fiscal Year 2006)
Budget Amount *help
¥10,900,000 (Direct Cost: ¥10,900,000)
Fiscal Year 2006: ¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 2005: ¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 2004: ¥5,200,000 (Direct Cost: ¥5,200,000)
Keywordstritium / hydrogen isotopic gas / environmental transfer / ground surface deposition velocity / oxidation rate / numerical model / exposure experiment / 温度依存性 / モデル / 土壌酸化菌 / 含水率
Research Abstract

The purpose of this study is to develop and validate a numerical model of tritium transfer in the environment by carrying out laboratory experiments of hydrogen isotopic gas oxidation by soil and measurements of tritium transfer in the environment.
Theoretical study showed that the tritium deposition process can be divided into three elemental processes of the atmospheric diffusion, the in-soil diffusion and the oxidation by microorganisms in soil, for each of which a conceptual model was developed. A one-dimensional multi-layer numerical model was developed and validated by using observation data on water vapor and carbon dioxide fluxes.
Dependency of hydrogen isotopic gas oxidation rate on concentration, temperature, soil moisture and soil type was quantitatively evaluated by laboratory experiments. The oxidation rate had the maximum value at the water content of 8 to 14 w % and 45 ℃. It was also found that the oxidation rate and the Michaelis constant can be expressed Arrhenium formul … More a well and the oxidation rate did not largely differ between soil types of andosol and alluvial soil.
The numerical model with these experimental results adopted was validated with the experimental data from Chalk River field tritium release experiment. Numerical experiments with this model illustrated the following characteristics of tritium deposition; 1) The HT deposition is mainly controlled by the diffusion and oxidation processes in soil. 2) The deposition velocity tends to have maximum values of about 0.2 to 0.4 mm s^<-1> at the volumetric water content of about 0.1. 3) Although the deposition velocity has a maximum value at around 45 ℃, the dependency on temperature is relatively small. These comprehensive results were compiled in such a way that they can easily be utilized in safety analyses.
A method was developed to determine chemical forms of tritium in gaseous effluent from a facility separately. This method was applied to a existing facility to evaluate the ratio of tritiated hydrogen to total tritium in gaseous effluent from a stack of a spent fuel reprocessing plant. A series of experiments of rice plant exposure to deuterated water were carried out to evaluate tritium transfer to agricultural products. Deuterium transfer characteristics, such as that OBD in grain at harvest showed the highest value when the exposure was in the early stage of the ripening period, were found Less

Report

(4 results)
  • 2006 Annual Research Report   Final Research Report Summary
  • 2005 Annual Research Report
  • 2004 Annual Research Report
  • Research Products

    (25 results)

All 2007 2006 2005 2004

All Journal Article (25 results)

  • [Journal Article] Measurement and modeling of oxidation rate of hydrogen isotopic gases by soil2007

    • Author(s)
      K.Ota, H.Yamazawa, J.Moriizumi, T.Iida
    • Journal Title

      J. Environmental Radioactivity (掲載決定)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Measurement and modeling of oxidation rate of hydrogen isotopic gases by soil2007

    • Author(s)
      K.Ota, H.Yamazawa, J.Moriizumi, T.Iida
    • Journal Title

      J. Envir. Radioactivity (in press)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] A simple and reliable monitoring system for ^3H and ^<14>C in adioactive airborne effluent2006

    • Author(s)
      J.Koarashi, et al.
    • Journal Title

      Journal of Radioanalytical and Nuclear Chemistry 268

      Pages: 475-479

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] A simple and reliable monitoring system for ^3H and ^<14>C in radioactive airborne effluent2006

    • Author(s)
      J.Koarashi, et al.
    • Journal Title

      J. Radioanalytical and Nucl. Chem. 268

      Pages: 475-479

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] A simples and reliable monitoring system for ^3H and ^<14>C in radioactive airborne effluent2006

    • Author(s)
      J.Koarashi, et al.
    • Journal Title

      Journal of Radioanalytical and Nuclear Chemistry 268

      Pages: 475-479

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Modeling Radon Flux Density from the Earth's Surface2006

    • Author(s)
      W.Zhuo, T.Iida, et al.
    • Journal Title

      Journal of Nuclear Science and Technology 43

      Pages: 479-482

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Depth Profiles of Radiocarbon and Carbon Isotopic Compositions of Organic Matter and CO_2 in a Forest Soil2006

    • Author(s)
      W.Liu, J.Moriizumi, H.Yamazawa, T.Iida
    • Journal Title

      Journal of Environmental Radioactivity 90

      Pages: 210-223

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Incorporation of CO_2 Exchange Processes into a Multilayer Atmosphere-Soil-Vegetation Model2005

    • Author(s)
      H.Nagai
    • Journal Title

      Journal of Applied Meteorology 44

      Pages: 1574-1592

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Radiocarbon and stable carbon isotope compositions of the mically fractionated soil organic matter in a temperate-zone forest2005

    • Author(s)
      Jun Koarashi, Takao lida, et al.
    • Journal Title

      Journal of Environmental Radioactivity 79

      Pages: 137-156

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] 「研究成果報告書概要(和文)」より2005

    • Author(s)
      M.Atarashi-Andoh, et al.
    • Journal Title

      Fusion Science and Technology 48

      Pages: 771-774

    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Upward Movement of Tritium from Contaminated Ground waters2005

    • Author(s)
      Y.Belot, H.Yamazawa, et al.
    • Journal Title

      Journal of Environmental Radioactivity 84

      Pages: 259-270

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary 2005 Annual Research Report
  • [Journal Article] Incorporation of CO_2 Exchange Processes into a Multilayer Atmosphere-Soil-Vegetation Model2005

    • Author(s)
      H.Nagai
    • Journal Title

      J. Appl. Meteorol. 44

      Pages: 1574-1592

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Radiocarbon and stable carbon isotope compositions of chemically fractionated soil organic matter in a temperate-zone forest2005

    • Author(s)
      Jun Koarashi, Takao Iida, et al.
    • Journal Title

      J. Envir. Radioactivity 79

      Pages: 137-156

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Formation of organically bound deuterium at each growing stage of rice2005

    • Author(s)
      M.Atarashi-Andoh, et al.
    • Journal Title

      Fusion Sci. Technol. 48

      Pages: 771-774

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Upward Movement of Tritium from Contaminated Ground waters2005

    • Author(s)
      Y.Belot, H.Yamazawa, et al.
    • Journal Title

      J. Envir. Radioactivity 84

      Pages: 259-270

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Incorporation of CO2 exchange process into a multilayer atmosphere-soil-vegetation model2005

    • Author(s)
      H.Nagai
    • Journal Title

      Journal of Applied Meteorology 44

      Pages: 1574-1592

    • Related Report
      2005 Annual Research Report
  • [Journal Article] 排気中トリチウムモニタリング手法の検証(再評価)と高度化への提言2005

    • Author(s)
      小嵐 淳, 他
    • Journal Title

      JNC TN8410 2005-004

      Pages: 1-62

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Formation of organically bound deuterium at each growing stage of rice2005

    • Author(s)
      M.Atarashi-Andoh, et al.
    • Journal Title

      Fusion Science and Technology 48

      Pages: 771-774

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Radiocarbon and stable carbon isotope compositions of chemically fractionated soil organic matter in a temperate-zone forest2005

    • Author(s)
      Jun Koarashi, Takao Iida, et al.
    • Journal Title

      Journal of Environmental Radioactivity 79

      Pages: 137-156

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Determination of chemical forms of 3H released to the atmosphere from the Tokai Reprocessing Plant2004

    • Author(s)
      Jun Koarashi, et al.
    • Journal Title

      Journal of Radionanalytical and Nuclear Chemistry 262

      Pages: 569-572

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary 2004 Annual Research Report
  • [Journal Article] Incorporating tritiated water into ^<14>C-sampling system for quantitative estimation of ^<14>C activity in airborne effluent2004

    • Author(s)
      Jun Koarashi, et al.
    • Journal Title

      Journal of Radioanalytical and Nuclear Chemistry 262

      Pages: 771-774

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Atmosphere-soil-vegetation model including C02 exchange process : SOLVEG22004

    • Author(s)
      H.Nagai
    • Journal Title

      JAERI-Data/Code 2004-014

      Pages: 1-92

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Determination of chemical forms of 3H released to the atmosphere from the Tokai Reprocessing Plant2004

    • Author(s)
      Jun Koarashi, et al.
    • Journal Title

      J. Radioanalytical and Nucl. Chem. 262

      Pages: 569-572

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Incorporating tritiated water into ^<14>C-sampling system for quantitative estimation of ^<14>C activity in airborne effluent2004

    • Author(s)
      Jun Koarashi, et al.
    • Journal Title

      J. Radioanalytical and Nucl. Chem. 262

      Pages: 771-774

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Atmosphere-soil-vegetation model including CO_2 exchange process : SOLVEG22004

    • Author(s)
      H.Nagai
    • Journal Title

      JAERI-Data/Code 2004-014

      Pages: 1-92

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary

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Published: 2004-04-01   Modified: 2016-04-21  

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