Radiographic Seminar Exam 2 Practice

Which part of the x-ray tube becomes negatively charged during exposure?

Cathode Anode Focusing cup Rotor

Correct Answer:

Cathode

Explanation:

During exposure, the negative voltage sits on the cathode. The cathode is heated and emits electrons (thermionic emission), producing the electron beam that is then attracted to the positively charged anode. The focusing cup, part of the cathode assembly, is also kept at a negative potential to help shape the beam, but the source of the electrons and the main negative charge is the cathode itself. The anode is positively charged to pull the electrons across, and the rotor is a mechanical part that doesn’t become the negative electrode.

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