An explosives detection system which includes computed tomography (CT) and quadrupole
resonance (QR) sensors for identifying particular explosive compounds present in
passenger baggage. The CT sensor may be configured to automatically identify the
presence or absence of bulk military, commercial, and sheet explosives during CT
scanning of the baggage. Similarly, the QR sensor may be configured to responsively
generate RDX and PETN signals during QR scanning of the passenger baggage. Using
any of a variety of inspection protocols, the explosives detection system may generate
an output alarm based upon data obtained from the CT and QR sensors.