Figure 7.103 Measured gamma spectra are dominated by silicon peak (channel 490)
whose depletion is an indication of voids in concrete structure.
Figure 7.102 Experimental setup.
7.6 More Objects to Be Inspected andInspection Requirements
363
Figure 7.105 shows the probability for detection of 14mm wide crack in con-
crete for 4mm collimator (upper curve) and 8mm collimator (lower curve) in
front of alpha detector ...
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