What type of technology is commonly used for baggage screening?

X-ray machines are widely used in baggage screening due to their ability to provide clear, detailed images of the contents within bags. These machines emit X-rays that penetrate through various materials, allowing security personnel to analyze the shadows and shapes that appear on the resulting images. This capability makes it easier to detect potential threats, such as weapons or explosives, by highlighting unusual items that may signify a security risk.

While metal detectors can identify metallic objects, they are not effective for screening bags that may contain non-metallic items, which could also pose security threats. Infrared sensors are primarily used for temperature detection and monitoring rather than for examining baggage. Ultrasonic scanners offer applications in other fields, such as assessing material thickness, but are not standard for baggage screening in airport security. Therefore, X-ray machines remain the preferred choice for thoroughly examining the contents of luggage in airport environments.