• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to project page

1999 Fiscal Year Final Research Report Summary

Transfer of tritium to crops, animals and fishes during an accidental release of tritium and its retension

Research Project

Project/Area Number 09308016
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section一般
Research Field Nuclear fusion studies
Research InstitutionIBARAKI UNIVERSITY

Principal Investigator

ICHIMASA Michiko  IBARAKI Univ. Fac. of Sci., Professor, 理学部, 教授 (60007557)

Co-Investigator(Kenkyū-buntansha) SAKUMA Yoichi  NIFS, Safety Div., Associate Professor, 安全管理センター, 助教授 (30133119)
SAITO Masahiro  KYOTO Univ. Res. Reactor Institute, Professor, 原子炉実験所, 教授 (40027454)
ICHIMASA Yusuke  IBARAKI Univ. Fac. of Sci., Professor, 理学部, 教授 (30007760)
OKAI Tomio  KYUSYU Univ. Fac. of Tec., Lecturer, 工学部, 講師 (50150488)
MOMOSHIMA Noriyuki  KUMAMOTO Univ. Fac. of Sci., Professor, 理学部, 教授 (80128107)
Project Period (FY) 1997 – 1999
KeywordsTritium / Environmental behavior / Tritiated water / Deuterium / Heavy water / DィイD22ィエD2O release experiment / Organically-bound tritium
Research Abstract

Tritium is released into the environment from unclear facilities including future unclear fusion reactors during ordinary operation or by an accident. Tritium toxicity is markedly different depending on its chemical form, tritiated water (HTO), molecular tritium (HT) and organically bound tritium (OBT), and HTO is four figures more radiotoxic than HT. From a view point of health physics, studies on tritium behavior in the environment are necessary for an accurate dose assessment ; such as actual HT oxidation in the local environment, transfer of HTO to soil, plants and animals, and OBT formation and tritium elimination in them. However, field experiments on environmental behavior of tritium are quite difficult to do because of the public acceptance problem. Thus heavy water (DィイD22ィエD2O) vapor release experiments into a plastic greenhouse put on a field at Mito site of IBARAKI University were conducted in August 1997, 1998, 1999, using DィイD22ィエD2O as a substitute for HTO under different conditions. In the 1997 experiment, DィイD22ィエD2O vapor release was for 2 days. In the 1998 experiments, DィイD22ィエD2O vapor was released in two open top plastic houses, one as daytime release and the other as nighttime release. In 1999, two DィイD22ィエD2O vapor release experiments, daytime release and nighttime release, were conducted in the air conditioned closed plastic greenhouses. The following studies were carried out and the results were obtained : uptake kinetics of DィイD22ィエD2O into leaves and edible parts of vegetation including rice, soybean, tomato, radish and so on, DィイD22ィエD2O concentration ratios in free water of vegetation to air moisture under steady-state conditions, OBD formation in crops, elimination kinetics from vegetation after DィイD22ィエD2O vapor release, transfer of DィイD22ィエD2O in water and aquatic organisms, deposition of DィイD22ィエD2O into soil and its reemission, and formation of molecular deuterium and deuteriated methane.

  • Research Products

    (22 results)

All Other

All Publications (22 results)

  • [Publications] M.Ichimasa et al.: "In vitro Determination of Oxidation of Atmospheric Tritium Gas in Vegetation and Soil in Ibaraki and Gifu,Japan"Journal of Radiation Research. 40. 243-251 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Ichimasa et al.: "Tritium,deuterium and gamma-emitting nuclides in plant leaves in the JCO campus"Journal of Environmental Radioactivity. 39(in press). (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] N.Momoshima et al.: "Uptake kinetics of deuteriated water vapor by plants : Experiments of D2O release in a greenhouse as a substitute for tritiated water"J.Radional.Nucl.Chem.. 239. 459-464 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Okai et al.: "Variation of atmospheric tritium concentrations in three different chemical forms in Fukuoka,Japan"J.Radional.Nucl.Chem.. 239. 527-531 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Atarashi et al.: "Deposition of D_2O from air to plant and soil during an experiment of D_2O vapor release into a vinyl house"Fusion Engineering and Design. 42. 133-140 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] S.Yokoyama et al.: "Reemission of heavy water deposited in soil to atmosphere"Fusion Engineering and Design. 42. 141-148 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] S/Sakai,H.Tanimoto and H.Mizubayashi: "Mechanical Behavior of High Density Hanocrystalline Gold Prepared by Gas Daposition Method"Acta Materialia. 47. 211-218 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Tanimoto,S.Sakai and H.Mizubayashi: "Anomaous Mechanical Behavior of High-density Nanocrystalline Gold"Tran.Mater.Research Soc.Japan. 24. 117-120 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Tanimoto,S.Sakai and H.Mizubayashi: "Mechanical Property of High Density Nanocrystalline Gold Prepared by Gas Deposition Method"NanoStructured Materials. 12. 751-756 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Mizubayashi and T.Okamoto: "Anomalous Elastic Behabvior and Probable Low-Temperature Homogeneous Deformation in Amorphous Allooys"Proc.of IMSP'97, edi.by T.Aizawa et al., (Mie Univ.Press,Japan). 209-216 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Mizubayashi,T.Okamoto,K.Koyama and M.Horiuchi: "Dynamic Anelastic Response of Amorphous Alloys Suggesting Collective Motion of Many Atoms"Acta Materialia. 46. 1257-1264 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Mizubayashi and N.Kameyama: "Effect of Passing Electric Current on the Crystallization Process in Amorphous Alloys"Proc.of the Thire Pacific Rim ; Int.Conf.on Advanced Materials and Proc., Ed.by M.A.Iman et al., (the Minerals,Materials and Materials Soc.). 2057-2062 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Mizubayashi and T.Okamoto: "Low-Temperature Homogeneous Deformation in Amorphous Alloys Induced under Electropulsing"Materials Science Forum. 304-306. 355-360 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Mizubayashi,M.Shiibasaki and S.Murayama: "Local Strain Around Hydrogen in Amorphous Cu_<50>Zr_<50> and Cu_<50>Ti_<50>"Acta Materialia.,47,3331-3338(1999). 47. 3331-3338 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Mizubayashi and N.Kameyama: "Effects of Electropulsing on the Crystallization Process in Amorphous Pd_<80>Si_<20>"Proc.of Intern.Conf.on Solic-Solic Phase Trans.'99(JIMIC-3), Edi.by M.Koiwa et al., (The Japan Institute of Metals,Sendai). 1235-1238 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 水林博: "晶質合金の特異な弾性挙動"金属. 69. 105-109 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M. Ichimasa, M.Suzuki, H.Obayashi, Y.Sakuma & Y.Ichimasa: "In vitro Determination of Oxidation of Atmospheric Tritium Gas in Vegetation and Soil in Ibaraki and Gifu, Japan"Journal of Radiation Research. 40. 243-251 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M. Ichimasa, E.Sasajima, K.Sato & Y.Ichimasa.: "Tritium, deuterium and gamma-emitting nuclides in plant leaves in the JCO campus"Journal of Environmental Radioactivity. 39,(in press). (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] N. Momoshima, H.Kakiuchi, T.Okai, S. Yokoyama, H.Noguchi, M.Atarashi, H.Amano, S.Hisamatsu, M.Ichimasa, Y.Ichimasa, Y.Maeda.: "Uptake kinetics of deuteriated water vapor by plants: Experiments of DィイD22ィエD2O release in a greenhouse as a substitute for tritiated water"Journal of Radioanalytical and Nuclear Chemistry. 239. 459-464 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. Okai, N.Momoshima & Y.Takashima: "Variation of atmospheric tritium concentrations in three different chemical forms in Fukuoka, Japan."Journal of Radioanalytical and Nuclear Chemistry. 239. 527-531 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M. Atarashi, H.Amano, M.Ichimasa & Y.Ichimasa: "Deposition of DィイD22ィエD2O from air to plant and soil during an experiment of DィイD22ィエD2O vapor release into a vinyl house"Fusion Engineering and Design. 42. 133-140 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S. Yokoyama, H.Noguchi, S.Fukutani, M.Ichimasa & Y.Ichimasa: "Reemission of heavy water deposited in soil to atmosphere."Fusion Engineering and Design. 42. 141-148 (1998)

    • Description
      「研究成果報告書概要(欧文)」より

URL: 

Published: 2001-10-23  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi