American Society of Radiologic Technologist (ASRT) Practice Exam

Which part of the x-ray tube is responsible for producing the x-rays?

1. Cathode

2. Filament

3. Anode

4. Grid

The correct answer is: Anode

The anode is responsible for producing x-rays in an x-ray tube. Within the x-ray tube, when the cathode heats the filament, it generates electrons through a process called thermionic emission. These electrons are then accelerated toward the anode due to the high voltage applied between the cathode and anode. Upon striking the anode, these high-speed electrons interact with the tungsten atoms of the anode target, resulting in the conversion of kinetic energy into x-rays. The majority of these interactions produce heat, but a small fraction generates x-ray photons through two mechanisms: characteristic radiation and Bremsstrahlung radiation. The role of the anode is critical because it not only provides a target for the electrons but also contributes to the efficient production of x-rays. Understanding this process is essential for anyone studying radiologic technology, as it highlights the fundamental operation of x-ray machines.