True, but they did nothing but talk for a little bit. If she was what they were looking for their actions would not have been of any value. In her case we had

True, but they did nothing but talk for a little bit. If she was what they were looking for their actions would not have been of any value. In her case we had just walked through a metal rectangle--could simply have been something to narrow the line to one person wide, or there could have been something in it. I had thought it was lining people up for an infrared camera (I had previously seen such a station with a monitor that was clearly showing an IR camera view of the crowd) but they called her over. This was Tc-99M, half life 6 hours, 140keV gamma emitter. Commonly used in imaging heart arteries.