What is the role of the high voltage generator in an x-ray tube?

• A. To produce low-energy x-rays
• B. To create a vacuum environment
• C. To accelerate electrons toward the anode
• D. To filter out unnecessary wavelengths

Answer: (C)

The role of the high voltage generator in an x-ray tube is crucial for the generation of x-rays, particularly through the acceleration of electrons toward the anode. In an x-ray tube, electrons are thermionically emitted from the cathode and need to be accelerated to a high velocity to collide with the anode material. This high-energy collision produces x-rays through a process known as Bremsstrahlung radiation, where the deceleration of electrons as they approach the positively charged anode generates x-ray photons.

The high voltage generator accomplishes this by supplying a significant voltage, typically in the range of kilovolts, which creates a strong electric field between the cathode and anode. The resultant high-speed electrons carry enough kinetic energy to produce x-rays upon striking the anode.

Understanding this function is essential as it highlights the necessity of having an efficient high voltage generator to ensure optimal x-ray production. Without it, the x-ray tube would not be able to produce sufficient energy to generate useful diagnostic images.