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Fig. 1.
Schematic diagram of Compton backscattering wall defect detection device.
Fig. 2.
Variation of backscattering peak area with detection angle and thickness of concrete wall.
Fig. 3.
Effect of backscattering angle on scattering element volume and backscattering peak area.
Fig. 4.
Energy spectrum of different detector rear collimating materials.
Fig. 5.
Example diagram for defect orientation detection of symmetrical distribution detector.
Fig. 6.
The use of ring array detectors in the determination of the direction of defects: the depth of the defect is, variously: (a) 1 cm, (b) 4 cm, and (c) 7 cm.
Fig. 7.
Variation of backscattered particle counts with different cross-sectional radius of defects.