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to generate sparks early 1700s, Francis Haukesbee may have been first person to prodice x ray when he observes a glow discharge during experiment with a vacuum tube.
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X-rays were found emanating from Crookes tubes, experimental discharge tubes invented around 1875, by scientists investigating the cathode rays, that is energetic electron beams
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tarting in 1888, Philipp Lenard, a student of Heinrich Hertz, conducted experiments to see whether cathode rays could pass out of the Crookes tube into the air.
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n November 8, 1895, German physics professor Wilhelm Röntgen stumbled on X-rays while experimenting with Lenard and Crookes tubes and began studying them.
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In 1895, Thomas Edison investigated materials' ability to fluoresce when exposed to X-rays, and found that calcium tungstate was the most effective substance.
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On 8 Nov, 1895, Wilhelm Conrad Röntgen (accidentally) discovered an image cast from his cathode ray generator,
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Radiation exposure from medical imaging in 2006 made up about 50% of total ionizing radiation exposure in the United States.