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2003 Fiscal Year Final Research Report Summary

Environmental behaviour of tritium and assessment of public absorption dose tritium

Research Project

Project/Area Number 13308023
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 Yusuke  Ibaraki University, College of Science, Professor, 理学部, 教授 (30007760)

Co-Investigator(Kenkyū-buntansha) FUKUI Masami  Kyoto University, Research Reactor Institute, Professor, 原子炉実験所, 教授 (40027462)
UDA Tatsuhiko  National institution for Fusion Science, Safety and Environmental Research Center, Professor, 安全管理センター, 教授 (50280590)
MOMOSHIMA Noriyuki  Kumamoto University, Department of Science, Professor, 理学部, 教授 (80128107)
WANATABE Atsumitsu  Hiroshima University, Research Institute for Radiation Biology and Medicine, Professor, 原爆放射能学研究所, 教授 (00034653)
KOMATSU Kenji  Kyoto University, Radiation Biology Center, Professor, 放射線生物研究センター, 教授 (80124577)
Project Period (FY) 2001 – 2003
KeywordsTritiated water / Tritium gas / Culture cell / Comet assay / Environmental behavior / Public Absorption dose / Tritium concentration in river fresh water / Tritium control in nuclear reactor
Research Abstract

(1)The low dose effects of tritiated water (HTO) on mouse lymphocyte DNA (in vitro irradiation) were determined by the comet assay using ICR male mouse of 20 to 23 weeks old. After lymphocytes were exposed to 17-50mGy of HTO, the lymphocytes embedded agarose gel slides were washed and cell lysis treatment was conducted before electrophoresis. The individual comets on stained slides after electrophoresis were analyzed using imaging software. No significant DNA damages were observed.
(2)Among the chemical forms of tritium released in the environment, tritiated water has a large contribution to the dose. Heavy water (D_2O) vapor release experiments were carried out in a greenhouse using D_2O as a substitute for HTO and uptake and loss kinetics of D_2O in leaves and formation, translocation and retention of organically bound deuterium (OBD) in bean of soy bean were investigated using different growth process of soybean. Rate constants of D_2 uptake in leaves in the daytime and nighttime release, rate constants and the half time of D_2O loss in leaves after release were determined. After D_2O release, OBD concentration in bean increased gradually until 3-4 days after the exposure and then decreased with time due to metabolic consumption in bean.
(3)An exposure condition of tritium radiation from nuclear fusion reactor could be a long-term exposure with low dose rate. The biological effects of low dose rate radiation are not clear because any suitable detection system has not been established. To examine the low dose rate effect of tritium, a hypersensitive mutation detection system using hamster cells carrying a human X-chromosome was established. The mutation induction by tritiated water at dose rate between 0.18 and 44 cGy/h was tested. The mutation frequency seemed to be slightly increased at lower dose rate.

  • Research Products

    (20 results)

All Other

All Publications (20 results)

  • [Publications] S.Yokoyama, H.Noguchi, Y.Ichimasa, M.Ichimasa: "Re-emission of heavy water vapour from soil to the atmosphere"Journal of Environmental Radioactivity. 71. 201-213 (2004)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] D.Galeriu, N.Beresford, H.Takeda, A.Melintescu, N.Crout: "Towards a model for the dynamic transfer of tritium and carbon in mammals."Radiation Protection Dosimetry. 105. 387-390 (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Masahiro Saito: "Blood tritium level as an estimate of soft tissue dose"Radiation Protection Dosimetry. 105. 417-420 (2003)

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      「研究成果報告書概要(和文)」より
  • [Publications] Fukui, M: "Distribution, origin and production of tritium in a research reactor containment building"Health Phys. (In press). (2004)

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      「研究成果報告書概要(和文)」より
  • [Publications] Y.SAKUMA, Y.OGATA, N.TSUJI, H.YAMANISHI, T.IIDA: "Removal of the Imprities from Environmental Water Samples for Tritium Measurement by Liquid Scintillation Counting"J.Radioanalytical and Nuclear Chemistry. 255. 325-327 (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] S.Yokoyama, H.Noguchi, Y.Ichimasa, M.Ichimasa: "Re-emission of heavy water vapour from soil to the atmosphere."Journal of Environmental Radioactivity. 71. 201-213 (2004)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y.Ichimasa, K.Otsuka, S.Maruyama, H.Tauchi, T.Uda, M.Ichimasa: "Effect of low dose tritium on mouse lymphocyte DNA estimated by comet assay."Proceedings of the International Symposium; Transfer of Radionuclides in Biosphere-Prediction and Assessment-, JAERI-Conf. 2003-010. 277-281 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] N.Ichimasa, T.Maejima, N.Seino, T.Ara, A.Masukura, S.Nishihiro, H.Tauchi, Y.Ichimasa: "Organically bound deuterium in soybean exposed to atmospheric D_2O vapor as a substitute fot hto under different growth phase."Proceedings of the International Symposium; Transfer of Radionuclides in Biosphere-Prediction and Assessment-, JAERI-conf. 2003-010. 226-232 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Ichimasa, C.Weng, T.Ara, Y.Ichimasa: "Organically bound deuterium in rice and soybean after exposure to heavy water vapor as a substitute for tritiated water."Fusion Science and Technology. 41. 393-398 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y.Ichimasa, H.Takano, T.Uda, M.Ichimasa: "Transfer of tritium from ^3H-thymidine, ^3H-thymidine, ^3H-glucose, and tritiated water into mouse tissue dna during long-term exposure."Fusion Science and Technology. 41. 417-421 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Atarashi-Andoh, H.Amano, H.Kakiuchi, M.Ichimasa, Y.Ichimasa: "Formation and retention of organically bound deuterium in rice in deuterium water release experiment."Health Phys. 82(6). 863-868 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Atarashi-Andoh, H.Amano, M.Ichimasa, Y.Ichimasa: "Conversion rate of HTO to OBT in plants"Fusion Science and Technology. 41. (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Tauchi, M.Ichimasa, Y.Ichimasa, T.Shiraishi, K.Morishima, S.Matsuura, K.Komatsu: "Studies of mutagenesis caused by low dose rate tritium using a novel hyper-sensitive detection system."Fusion Science and Technology. 41. 413-416 (2002)

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      「研究成果報告書概要(欧文)」より
  • [Publications] M.Komuro, Y.Ichimasa, M.Ichimasa: "TY oxidation in soils in Ibaraki and isolation, identification of HT oxidizing soil bacteria."Fusion Science and Technology. 41. 422-426 (2002)

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      「研究成果報告書概要(欧文)」より
  • [Publications] N.Momoshima, Y.Hayashi: "Meteorologically induced seasonal variation of tritium concentration in rain at Fukuoka, Japan."Advances in Liquid Scintillation Spectrometry. 181-187 (2002)

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      「研究成果報告書概要(欧文)」より
  • [Publications] N.Momoshima, H.Kakiuchi: "Development of a new detritiation system using microorganisms."Fusion Science and Technology. 41. 404-408 (2002)

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      「研究成果報告書概要(欧文)」より
  • [Publications] T.Gamo, N.Morishima, S.Tolmachyov: "Recent upward shift of the deep convection system in the Japan Sea, as inferred from the geochemical tracers tritium, oxygen, and nutrients."Geophysical Research Letters. 28. 4143-4146 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] D.Galeriu, N.A.Beresford, H.Takeda, A.Melintescu, H.M.J.Crout: "Towards a model for the dynamic transfer of tritium and carbon in mammals."Rediation Protection Dosimetry. 105. 387-390 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] 小室真保, 一政祐輔, 一政満子: "土壌から分離したトリチウムガス(水素)酸化能を持つ放線菌Kitasatospora属の同定"Radioisotopes. 52. 667-676 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Uda, S.Tanahashi, K.Nishimura, K.Shinotsuka, O.Motojima: "Preliminary Tritium safety analysis and problems with obtaining public consent to deuterium plasma experiments in the LHD"Fusion Science and Technology. 41,3,Part2. 652-657 (2002)

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Published: 2005-04-19  

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