The simplified diagram below shows the design of an evacuated X-ray tube used in clinical diagnostics.

Identify the components or features located at Region A, Region B, and Region C, and explain their respective roles in the generation of X-ray photons.
During clinical imaging, the intensity of the X-ray beam is reduced as it passes through bone and muscle. One mechanism responsible for this attenuation is the photoelectric effect.
Identify and describe two other physical interaction mechanisms by which X-ray photons undergo attenuation when passing through matter.