When a passenger puts their bags through an X-ray machine, they go through a type of electromagnetic energy. Unlike visible light, humans cannot see X-rays. In hospitals, these X-ray energy beams can see through skin tissue to detect broken bones, tumors or other injuries. In an airport. x-ray technology is used in CT(computer tomography) scanners. Suitcases from passengers ride along a conveyor belt and pass through the hollow CT scanning machines. The X-rays bounce off the objects inside the suitcases, measuring the density and mass of each object. All that data is immediately entered into a computer. CT scanners are more complex than metal detectors and can analyze chemical in components in addition to metallic objects. If the density and mass of items in the suitcase