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In 1895, the German physicist Wilhelm Conrad Röntgen was experimenting with a cathode-ray tube in his laboratory when he noticed a nearby fluorescent screen beginning to glow. This was unexpected because an opaque piece of cardboard shielded the tube, which should have blocked any known light. He deduced that he had discovered a new and invisible type of ray capable of passing through solid objects. Unsure of the exact nature of this radiation, he temporarily labeled it "X-radiation," using the mathematical symbol for an unknown quantity. This name, born out of scientific uncertainty, has remained in common use ever since.
Röntgen's discovery quickly revolutionized the scientific and medical fields. One of the first images he produced was a startling picture of the bones in his wife's hand, dramatically showcasing the rays' diagnostic potential. For his groundbreaking work, he was awarded the very first Nobel Prize in Physics in 1901. The Nobel committee recognized him for "the discovery of the remarkable rays subsequently named after him."
Indeed, while the term X-ray is widely used, Röntgen's name is directly synonymous with his discovery in many parts of the world. In his native Germany and other European countries, it is common to refer to X-rays as "Röntgenstrahlen," which translates to "Röntgen rays." Demonstrating great altruism, Röntgen refused to patent his discovery, believing its benefits should be freely available to all of humanity.
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