Interestingly, while considered safe for humans, Technetium-99m has the potential for setting off anti-terrorist radiation detectors that Homeland Security has placed in airports and other strategic locations. The accompanying photograph depicts the radiation card I received and was told to carry for the next three days (the half-life of Technetium-99m) on the off chance that my status as an irradiated human being might trigger a false security breach somewhere.
One of my students today also suggested that - should such an act of false radiation alert occur - that simultaneously shouting Allahu Akbar would not be found humorous by Homeland Security types.