page_title: X-ray generator
section_title: Color classification
hierarchical_section_title: X-ray generator / Applications / Security / Color classification
caption_attribution_description: English: Photograph of a baggage screening x-ray display, taken at the Verkehrshaus (Swiss Museum of Transport). Lucern, Switzerland on October 23, 2006 by Duke
context_page_description: An X-ray generator is a device that produces X-rays. Together with an X-ray detector, it is commonly used in a variety of applications including medicine, X-ray fluorescence, electronic assembly inspection, and measurement of material thickness in manufacturing operations. In medical applications, X-ray generators are used by radiographers to acquire x-ray images of the internal structures of living organisms, and also in sterilization.
context_section_description: The colour of the image displayed depends upon the material and material density : organic material such as paper, clothes and most explosives are displayed in orange. Mixed materials such as aluminum are displayed in green. Inorganic materials such as copper are displayed in blue and non-penetrable items are displayed in black (some machines display this as a yellowish green or red). The darkness of the color depends upon the density or thickness of the material.
  The material density determination is achieved by two-layer detector. The layers of the detector pixels are separated with a strip of metal. The metal absorbs soft rays, letting the shorter, more penetrating wavelengths through to the bottom layer of detectors, turning the detector to a crude two-band spectrometer.
caption: X-ray image of a backpack. Organic and inorganic materials are discriminated in using dual energy techniques.
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