Final answer:
The question pertains to the contrast differences between cesium iodide and zinc cadmium sulfide intensifier tubes used in medical imaging. Cesium iodide intensifier tubes exhibit enhanced contrast compared to older zinc cadmium sulfide intensifier tubes. In other CRT-based technology like older TVs, x-rays can be generated, but shielding prevents exposure to viewers.
Step-by-step explanation:
The student is asking about the contrast differences between modern cesium iodide intensifier tubes and older zinc cadmium sulfide intensifier tubes in various x-ray technology applications. Since this detail is more focused on the function of image intensifiers, the correct answer would be image intensifier.
Cathode Ray Tubes (CRTs), like those used in older television sets and monitors, use electrons to stimulate phosphors on the screen to create an image. When electrons strike these phosphors with sufficient energy, such as the 30-kV potential mentioned, there is a possibility of creating x-rays. Modern medical imaging, which includes x-rays and other techniques, often uses refinements of these principles to provide detailed images for diagnostic purposes. In the case of older television tubes, some x-rays might be generated, but shielding in the device would prevent these from reaching the viewer. In medical imagery, contrast enhancement is critical for clear and effective images, and newer technologies like cesium iodide provide improvements over older phosphor types.