Which statement is FALSE regarding the X-ray tube and generator?

• A. The filament circuit applies high voltage to the anode
• B. The cathode consists of a filament
• C. The anode converts electron energy into X-rays
• D. The X-ray tube operates under vacuum conditions

Answer: (A)

The statement that the filament circuit applies high voltage to the anode is false. In an X-ray tube, the filament circuit is responsible for heating the filament in the cathode, which in turn emits electrons when the filament is heated enough. This process is known as thermionic emission. The high voltage is applied across the anode and cathode to create a potential difference, which accelerates the emitted electrons towards the anode, where they interact with the target material to produce X-rays. Therefore, the filament circuit’s role is strictly related to the cathode and does not involve applying high voltage to the anode.

The cathode indeed consists of a filament, which is crucial for generating the electrons needed for X-ray production. The anode is responsible for converting the kinetic energy of these accelerated electrons into X-rays upon their impact. Additionally, the operation of the X-ray tube under vacuum conditions is essential to minimize the scattering of electrons and ensure efficient X-ray production.