Development of positron annihilation spectroscopy for characterizing neutron irradiated tungsten
Tungsten samples (6 mm diameter, 0.2 mm thick) were irradiated to 0.025 and 0.3 dpa with neutrons in the High Flux Isotope Reactor (HFIR) at Oak Ridge National Laboratory. Samples were then exposed to deuterium plasma in the tritium plasma experiment (TPE) at 100, 200 and 500ºC to a total fluence of 1 x 1026 m-2. Nuclear reaction analysis (NRA) and Doppler broadening positron annihilation spectroscopy (DB-PAS) were performed at various stages to characterize damage and retention. We present the first known results of neutron damaged tungsten characterized by DB-PAS in order to study defect concentration. Two positron sources, 22Na and 68Ge, probe ~58 µm and through the entire 200 µm thick samples, respectively. DB-PAS results reveal clear differences between the various irradiated samples. These results, and the calibration of DB-PAS to NRA data are presented.
- Research Organization:
- Idaho National Laboratory (INL)
- Sponsoring Organization:
- DOE - SC
- DOE Contract Number:
- AC07-05ID14517
- OSTI ID:
- 1097176
- Report Number(s):
- INL/CON-13-28038
- Country of Publication:
- United States
- Language:
- English
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