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Ukrainian Physicist Contributes to the Discovery of X-Rays

      Ukrainian-born physicist Ivan Pawlowich Puluj is best known for his early investigations on cathode rays and radiation. In 1877, he constructed a cathode ray tube (or lamp), called “Puluj's tube”; subsequent refinements led to his creation of a vacuum tube in 1879. By passing electricity through the tube containing rarified gas, Puluj produced cathode rays (highspeed electrons). Between 1881 and 1882, he published reports on cathode rays, and in 1883, he wrote an article about his vacuum tube. By 1886, he had recorded his first photographic plate of the radiation phenomenon. In his 1889 experiments on electricity and gases, Puluj noted that photographic plates became black when exposed to cathode rays. That same year, the Physical Society of London published a translation of his monograph on cathode rays. Although Puluj essentially produced x-rays from cathode rays focused on a photographic plate, he did not recognize the emission as x-rays. German physicist Wilhelm Rántgen (1845-1923) is credited with their discovery in Wiirzburg, Germany, on Nov. 8,1895, almost 7 years later.
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