Using UT to assess neutron-induced damage

Figure 10: Frequency spectrum change in the backscattering echo in the region of 36-50mm from the surface due to dislocations



  • Figure 1a: Schematic images of ultrasonic signal interactions with microstructure components
  • Figure 1b: a trace of a scan showing ultrasonic signal interactions with microstructure components
  • Figure 2: Display of the ultrasonic signal in the time domain
  • Figure 3: Comparison of predicted and experimentally-obtained spectra of back-wall echo of the unirradiated archive material
  • Figure 4: Comparison of predicted and experimentally-obtained spectra of backscattering echo of the unirradiated archive material in a depth region of 9-23mm from the surface
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  • Figure 5: Frequency spectrum change in the back-wall echo due to homogeneously distributed 1.3% swelling. The amplitude of peak frequency moves down, decreasing
  • Figure 6: Frequency spectrum change in the backscattering echo in the region of 36-50mm from the surface due to homogeneously distributed 1.3% swelling
  • Figure 7: Frequency spectrum change in the back-wall echo due to homogeneous carbide formation
  • Figure 8: Frequency spectrum change in the backscattering echo in the region of 36-50mm from the surface due to homogeneous carbide formation
  • Figure 9: Frequency spectrum change in the back-wall echo due to dislocations
  • Figure 10: Frequency spectrum change in the backscattering echo in the region of 36-50mm from the surface due to dislocations
  • Figure 11: Plots of 5-10 MHz frequency spectra vs depth for each case. Frequency spectra is shown as area integral normalized at 17mm depth
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