1. Ph.D. Candidate, Dept. of Building, Civil, and Environmental Engineering, Concordia Univ., Montréal, QC, Canada H3G 1M7 (corresponding author).
2. Professor, Dept. of Building, Civil, and Environmental Engineering, Concordia Univ., Montréal, QC Canada H3G 2W1.
3. President/Owner, Romero NDT & E, 134 Hockenbury Dr., Glen Gardner, NJ 08826.
4. President, Radex Detection, Inc., 353 St-Nicolas, Ste. 001, Montréal, QC, Canada H2Y 2P1.