People getting radioactive treatments can set off the new radiation detectors that are part of Homeland Security.

  Radiation detection devices have been installed as part of heightened Homeland Security measures. They are now tucked away in many public places such as subway stations, tunnels, and national borders.

  Surprisingly, patients often have detectable amounts of radiation after getting treatment with radiopharmaceuticals. In fact, they may emit enough radiation to set off a radiation detection alarm.

  In one recent incident, a bus was stopped after setting off a tunnel detector in New York City. It turned out there was a man on board that had undergone a nuclear thyroid treatment earlier that day.