In 1895, Wilhelm Roentgen accidentally discovered that a cathode-ray tube could make a sheet of paper coated with barium platinocyanide glow, even when the tube and the paper were in separate rooms.
1895年,威廉·伦琴偶然现阴极射线管有一层氰亚酸盐钡的薄光,甚至当阴极射线管和分别放在不同的房间时也光。