| 摘要 |
<p>The generation of X-radiation occurs when a powder (14, 24, 38, 47, 58) is subjected to electro-dispersion in an evacuated chamber. The powder is of a conducting or semiconducting material, and is supported on the lower of two electrodes (10, 11; 22, 25; 36, 39; 44, 48; 52, 56) in the chamber. When the chamber pressure is about 10-5 Torr or lower, and a high voltage is applied across the electrodes, part of the powder forms a dispersed particulate cloud in the space between the electrodes. The dispersion of the powder results in the generation of X-radiation which is transmitted through the wall (13) of the chamber or through a window (28, 35, 45) in the apparatus. Visible light is produced if a phosphor (29) is included in the chamber, and is irradiated by X-rays generated upon dispersion of the powder, or if the powder includes particles of a phosphor. </p> |
