Question

Deposition of vaporized tungsten on the inner surface of the x-ray tube glass window 1. acts as additional filtration 2. results in increased tube output 3. results in anode pitting

(A) 1 only
(B) 1 and 2 only
(C) 2 and 3 only
(D) 1, 2, and 3

Answer 1

Deposition of vaporized tungsten on the x-ray tube glass adds extra filtration, reducing the intensity of lower energy x-rays without increasing tube output or causing anode pitting.

Step-by-step explanation:

When deposition of vaporized tungsten occurs on the inner surface of an x-ray tube glass window, it primarily acts as additional filtration. This filtration is because the layer of tungsten will absorb some energy of the emitted x-rays, filtering out lower-energy photons and thus, hardening the x-ray beam produced. However, this does not lead to increased tube output; in fact, it might reduce the overall intensity of the output because of this filtration effect. Lastly, the deposition of tungsten does not result in anode pitting; this phenomenon usually occurs due to the high-energy impact of electrons on the anode material. Therefore, the correct answer is (A) 1 only - the act of deposition serves as additional filtration.