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... AND RADIOISOTOPES 332 THE PHENOMENON OF RADIOACTIVITY AND RADIOISOTOPES 332 WILLIAM CROOKES (1832-1919) English Physicist 333 Inventor of the Vacuum Tube or the Cathode Ray Tube. WILHELM K. ROENTGEN (1845-1923) German Physicist 335 Discovered the X-Rays. ANTOINE HENRI BECQUEREL (1852-1908) French Physicist 336 Discovered the Phenomenon of Radioactivity. PIE...