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.

The full results of this study on radiofrequency ablation of kidney tumors appear in the August 2007 issue of the American Journal of Roentgenology, published by the American Roentgen Ray Society.