Question

In an X-ray tube, the intensity of the emitted X-ray beam is increased by -

• A. increasing the filament current.
• B. decreasing the filament current.
• C. increasing the target potential.
• D. decreasing the target potential.

Answer 1

The correct option is A increasing the filament current.

If we increase the filament current, the temperature of the filament rises and so the number of thermionic electrons emitted per second increases.

These results increase in number of electrons striking the target per second, and hence number of X-ray photons emitted per second increases.

​​​​​​​Hence, option $\left(A\right)$ is the correct answer.