INBDE (Integrated National Board Dental Examination) Practice Exam

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In X-ray production, the tungsten filament functions as what?

Anode
Cathode
Filtration
Collimation

The correct answer is: Cathode

In X-ray production, the tungsten filament produces free electrons through thermionic emission and functions as the cathode, which is the negative electrode in the X-ray tube. The anode, or positive electrode, receives the electrons and converts them into X-ray photons. Filtration and collimation are processes that occur after the X-rays are produced and do not involve the tungsten filament.