Röntgen, Wilhelm Conrad   1845 - 1923                                  Röntgen also spelled ROENTGEN German                                physicist who was a recipient of the first Nobel                                              Prize for Physics, in 1901, for his discovery of                                 X rays, which heralded the age of modern                                physics and revolutionized diagnostic medicine.   In 1895, while experimenting with electric current flow in a partially evacuated glass tube (cathode-ray tube), Röntgen observed that a nearby piece of barium platinocyanide** gave off light when the tube was in operation. He theorized that when the cathode rays (electrons) struck the glass wall of the tube, some unknown radiation was formed that traveled across the room, struck the chemical, and caused the fluorescence.   Further investigation revealed that paper, wood, and aluminum, among other materials, are transparent to this new form of radiation. He found that it affected photographic plates, and, since it did not noticeably exhibit any properties of light, such as reflection or refraction, he mistakenly thought the rays were unrelated to light. In view of its uncertain nature, he called the phenomenon X radiation, though it also became known as Röntgen radiation. He took the first X ray photographs, of the interiors of metal objects and of the bones in his wife's hand.  © 1999-2000 Britannica.com Inc.   ** platinocyanide n. (Chem.) A double cyanide of platinum and some other metal or radical.