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Table 2 Significant of intensity zones (Gostautas et al., 2005).

From: Investigation on Acoustic Emission Parameters due to Fatigue Damage of Concrete Beams with Variable Notched Depth

Level Recommended action
Aa Insignificant AE
Bb Note for reference in future tests. Typically minor surface defects, such as corrosion, pitting, gouges, or crack attachments welds
C Defects requiring follow-up evaluation, which may be based on further data analysis or complementary non-destructive examination
D Significant defect requiring follow-up inspection
E Major defect requiring immediate shut-down and follow-up inspection
  1. aNo significant emission.
  2. bMinor.