The background level of electromagnetic radiation that you get while while standing a few feet from the X-ray and magnetometer machines (not to mention the flourescent lights, etc.) asking the TSA to search you in another room will FAR exceed the "dose" you get from actually walking through the machine.

This reminds me of a snooze story about the "dangers" of electric blankets some years ago. The amount of electromagnetic radiation from the blankets was virtually indistinguishable from the background amounts and scientists had to go into a special laboratory that masked the backgrond levels just to measure it.

Did your doctor also warn you about the amount of radiation you are exposed to when sitting in an aluminum tube at 35k feet for 3 or 4 hours?