During exposure, which component rotates?

During exposure, which component rotates?

• A. Cathode
• B. Anode
• C. Filament
• D. Glass envelope

Answer: (B)

The anode rotates. Spinning the target spreads the heat from the electron impacts over a larger surface, preventing local overheating and helping the tube handle high exposures. The focal spot sits on the rotating anode, so rotation is essential for thermal management and tube longevity. The filament in the cathode and the glass envelope are stationary, with the filament heating to emit electrons and the envelope serving as the vacuum housing.

The anode rotates. Spinning the target spreads the heat from the electron impacts over a larger surface, preventing local overheating and helping the tube handle high exposures. The focal spot sits on the rotating anode, so rotation is essential for thermal management and tube longevity. The filament in the cathode and the glass envelope are stationary, with the filament heating to emit electrons and the envelope serving as the vacuum housing.