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Positron lifetime study of ion-irradiated tungsten: Ion type and dose effects
- Source :
- Nuclear Materials and Energy, Vol 38, Iss , Pp 101610- (2024)
- Publication Year :
- 2024
- Publisher :
- Elsevier, 2024.
-
Abstract
- Polycrystalline recrystallized tungsten samples were irradiated with 7.5 MeV Si ions and 9 MeV Cu ions to three different damage levels (0.01, 0.1, 0.5 dpa at 200 nm depth) at 295 K. The resulting vacancy-type defects in the samples were studied using positron annihilation lifetime spectroscopy. The dependence of the average positron lifetime on the damage level is found to be non-linear: a steep increase at low damage levels with a tendency to saturation at higher damage levels (>0.1 dpa). The average positron lifetime of Si and Cu-irradiated tungsten is very similar at each damage level, suggesting similar vacancy-type defect structure. Deconvolution of the positron lifetime spectra revealed that the dominant irradiation-induced defect type is a single vacancy. The presence of small vacancy clusters is also detected. Their fraction is found to increase with increasing damage level.
Details
- Language :
- English
- ISSN :
- 23521791
- Volume :
- 38
- Issue :
- 101610-
- Database :
- Directory of Open Access Journals
- Journal :
- Nuclear Materials and Energy
- Publication Type :
- Academic Journal
- Accession number :
- edsdoj.8a3ca75e3ea74de7879b64ff667d2997
- Document Type :
- article
- Full Text :
- https://doi.org/10.1016/j.nme.2024.101610