X-ray machines for airport security.
D001359:Aviation; D003415:Crime; D006801:Humans; D007883:Legislation, Medical; D008452:Maximum Allowable Concentration; D009784:Occupational Diseases / Q000517:prevention & control; D011481:Protective Clothing; D011829:Radiation Dosage; D011832:Radiation Injuries / Q000517:prevention & control*; D011839:Radiation, Ionizing; D014195:Travel; D014481:United States; D014965:X-Rays