Materials Transactions Online

Materials Transactions, Vol.47 No.11 (2006) pp.2885-2887
© 2006 The Japan Institute of Metals

Coincidence Doppler Broadening of Positron Annihilation Radiation for Detection of Helium in Irradiated Ni and Cu

Q. Xu1, T. Ishizaki2, K. Sato1, T. Yoshiie1 and S. Nagata3

1Research Reactor Institute, Kyoto University, Sennan-gun, Osaka 590-0494, Japan
2Toyota Central R&D Labs., Aichi-gun, Aichi 480-1192, Japan
3Institiute for Materials Research, Tohoku University, Sendai 980-8577, Japan

A new composition analysis method, namely, coincidence Doppler broadening (CDB) of positron annihilation radiation, was employed to detect He atoms in ion irradiated Ni and neutron irradiated Cu. The results of positron lifetime and transmission electron microscopy (TEM) show that microvoids and voids were formed in ion-irradiated Ni and neutron-irradiated Cu, respectively. The results of CDB measurements indicate that He atoms were present in the microvoids and voids, even in microvoids annealed at 1273 K in ion-irradiated Ni. Coincidence Doppler broadening measurement, which is a nondestructive technique for testing materials, is effective for detecting He atoms.

(Received 2006/7/18; Accepted 2006/9/15; Published 2006/11/15)

Keywords: helium, microvoids, voids, positron annihilation

PDF(Free)PDF (Free) Table of ContentsTable of Contents

REFERENCES

  1. Q. Xu, N. Yoshida and T. Yoshiie: Mater. Trans. 46 (2005) 1255.
  2. Q. Xu, N. Yoshida and T. Yoshiie: J. Nucl. Mater. (2006) in press.
  3. M. D'Olieslaeger, G. Knuyt, L. De Schepper and L. M. Stals: Fundamental Aspects in Inert Gas in Solids Ed, by S. E. Donnelly and J. H. Evans, (Plenum, 27, 1991).
  4. J. B. Conndon and T. Shober: J. Nucl. Mater. 207 (1993) 1.
  5. K. Farrell: Rad. Eff. 53 (1980) 175.
  6. K. Ono, T. Kino, S. Furuno, K. Hojou, K. Izui, K. Mizuno and K. Ito: J. Nucl. Mater. 179–181 (1991) 978.
  7. K. Niwase, T. Ezawa, T. Tanabe, M. Kiritani and F. E. Fujita: J. Nucl. Mater. 203 (1993) 56.
  8. A. Dupasquier and A. P. Mills, Jr.: Positron Spectroscopy of Solids (IOS Press, Amsterdam, 1995).
  9. P. Asoka-Kumar, M. Alatalo, V. J. Ghosh, A. C. Kruseman, B. Nielsen and K. G. Lynn: Phys. Rev. Lett. 77 (1996) 2097.
  10. Q. Xu, T. Yoshiie and K. Sato: Phys. Rev. B 73 (2006) 134115.
  11. Q. Xu and T. Yoshiie: Mater. Sci. Forum 445–446 (2004) 216.
  12. J. P. Biersack and L. G. Haggmark: Nucl. Instrum. Meth. 174 (1980) 257.
  13. T. Yoshiie, Y. Hayashi, S. Yanagita, Q. Xu, Y. Satoh, H. Tsujimoto, T. Kozuka, K. Kamae, K. Mishima, S. Shiroya, K. Kobayashi, M. Utsuro and Y. Fujita: Nucl. Instrum. Methods, Phys. Res. A 498 (2003) 522.
  14. L. R. Greenwood: Fusion Reactor Mater. Semiann. Prog. Rep. DOE/ER-0313/18, 27 (1995).
  15. P. Kirkegaard, M. Eldrup, O. E. Morgensen and N. J. Pedersen: Comput. Phys. Commun. 23 (1981) 307.
  16. M. J. Puska and R. M. Nieminen: J. Phys. F: Met. Phys. 13 (1983) 333.

[JIM HOME] [JOURNAL ARCHIVES]

© 2006 The Japan Institute of Metals
Comments to us : editjt@jim.or.jp