<font face="Verdana, Arial, Helvetica, sans-serif" size="2">Originally posted by HomelessScientist:
The x-ray machines used for screening CARRY-ON bags are basically the same that have been used for a number of years. The radiation dose to your baggage from these machines is quite low. You have the right to request a hand inspection of your film at U.S. airports, but you probably won't be able to notice the difference if you run ordinary film (say, ISO 400 or less) through a few times. In any event, there is no danger to your camera there, just your film.</font>
The newest machines used to scan cabin baggage use very low doses indeed. Although you wouldn't want to do it without a reason, they shouldn't harm a human who is accidentally put through the machine once.