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Tracking of tritium trapped on/in high-Z materials by BIXS

Research Project

Project/Area Number 13480133
Research Category

Grant-in-Aid for Scientific Research (B)

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

Principal Investigator

MATSUYAMA Masao  Toyama Univ., Hydrogen Isotope Research Center, Prof., 水素同位体科学研究センター, 教授 (90135004)

Co-Investigator(Kenkyū-buntansha) HARA Masanori  Toyama Univ., Hydrogen Isotope Research Center, Assistant, 水素同位体科学研究センター, 助手 (00334714)
TORIKAI Yuji  Toyama Univ., Hydrogen Isotope Research Center, Lecturer, 水素同位体科学研究センター, 講師 (80313592)
HATANO Yuji  Toyama Univ., Hydrogen Isotope Research Center, Associate Prof., 水素同位体科学研究センター, 助教授 (80218487)
Project Period (FY) 2001 – 2002
Project Status Completed (Fiscal Year 2002)
Budget Amount *help
¥14,300,000 (Direct Cost: ¥14,300,000)
Fiscal Year 2002: ¥3,200,000 (Direct Cost: ¥3,200,000)
Fiscal Year 2001: ¥11,100,000 (Direct Cost: ¥11,100,000)
Keywordstritium / nondestructive measurement / bremsstrahlung x-ray spectrum / characteristic x-ray spectrum / depth profile / tritium inventory / accountability / safe handling technique / 拡散係数
Research Abstract

Trap and/or diffusion behavior of tritium in high-Z materials such as W and Mo, which are promising candidate as plasma-facing materials of fusion devices, have been studied by means of β-ray-induced X-ray spectrometry (BIXS). Main results obtained in the present study were as follows :
(1) Diffusion behavior of tritium in W at room temperature
A given amount of tritium ions was implanted in a tungsten sample, and then change in β-ray-induced X-ray spectra at room temperature was tracked. The X-ray spectra observed were analyzed by means of computer simulation to estimate tritium depth profiles in tungsten. From change in the depth profiles, the diffusion coefficient of tritium at room temperature was estimated to be 2.4x10^<19> m^2/s.
(2) Thermal behavior of tritium ions implanted into W
The tungsten sample irradiated with tritium was stepwise heated from room temperature to 700℃, and an X-ray spectrum was measured after each heating As a result, both X-ray intensities of Ar and W decreased with the increase of temperature, and they decreased to about 10% of the initial intensity at 500℃, indicating hat most of the implanted tritium desorbed from surface layers and bulk of the sample.
(3) Effect of He pre-irradiation on the trap and diffusion behavior of tritium
When tritium was implanted into the He pre-irradiation sample, the X-ray intensity of Ar was about 5 times great in comparison with the He non-irradiation sample, and no change in the intensity at room temperature was observed for five months. Namely, it was seen that the retention of tritium strongly increased with the He pre-irradiation. The amount of tritium in surface layers decreased with heating, but that in bulk did not change up to 350℃. This indicates that the implanted tritium was strongly trapped at lattice imperfections formed by the He pre-irradiation, and the trapping energy of tritium was estimated to be about 1.2eV.

Report

(3 results)
  • 2002 Annual Research Report   Final Research Report Summary
  • 2001 Annual Research Report
  • Research Products

    (7 results)

All Other

All Publications (7 results)

  • [Publications] M.Matsuyama, T.Murai, K.Watanabe, H.Iwakiri, K.Yoshida: "Studies on retention of tritium implanted into tungsten by β-ray-induced X-ray spectrometry"J. Nuclear Materials. 307-311. 729-734 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] M.Matsuyama, T.Murai, K.Watanabe, H.Iwakiri, K.Yoshida: "Thermal behavior of tritium implanted in tungsten pre-irradiated with He"Ann. Report of Hydrogen Isotope Research Center, Toyama Univ.. (in press).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] M. Matsuyama, T. Murai, K. Watanabe, H. iwakiri, and K. Yoshida: "Studies on retention of tritium implanted into tungsten by β-ray-induced X-ray spectrometry"J. Nuclear Materials. 1. 307-311-729-734 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] M. Mstsuyama, T. Mural, K. Watanabe, H. iwakiri, and K. Yoshida: "Thermal behavior of tritium implanted in tungsten pre-irradiated with He, Ann. Report of Hydrogen Isotope Research Center"Toyama University, (in press).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] M.Matsuyama, T.Murai, K.Watanabe, H.Iwakiri, K.Yoshida: "Studies on retention of tritium implanted into tungsten by β-ray-induced X-ray spectrometry"J.Nuclear Materials. 307-311. 729-734 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] M.Matsuyama, T.Murai, K.Watanabe, H.Iwakiri, K.Yoshida: "Thermal behavior of tritium implanted in tungsten pre-irradiated with He"Ann.Report of Hydrogen Isotope Research Center, Toyama Univ.. (in press).

    • Related Report
      2002 Annual Research Report
  • [Publications] M.Matsuyama, T.Murai, K.Yoshida, K.watanabe: "Studies on Retention of Tritium Implanted into Tungsten by β-Ray-Induced X-Ray Spectrometry"Proc.Int.Conf.10^<th> ICFEM, Oct. 14-19,(2001), Baden-Baden, Germany ; J. Nucl, Mater. (in press).

    • Related Report
      2001 Annual Research Report

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Published: 2001-04-01   Modified: 2016-04-21  

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