Hidden screening devices are used to track the movement of dangerous materials—and recently caught a shipment of uranium at London’s Heathrow Airport.
https://www.wired.com/story/heathrow-radioactive-cargo-screening/?utm_source=dlvr.it&utm_medium=blogger
https://www.wired.com/story/heathrow-radioactive-cargo-screening/?utm_source=dlvr.it&utm_medium=blogger