During x-ray production, which electron shell is capable of producing the highest-energy photons?

The K-shell is identified as the shell capable of producing the highest-energy photons during x-ray production due to its proximity to the nucleus of the atom and the high binding energy of the electrons located in this shell. When an electron from the K-shell is ejected, the resulting vacancy can lead to the emission of high-energy x-ray photons as outer-shell electrons transition to fill the gap. This transition releases energy that corresponds to the difference in binding energy between the shells, resulting in the emission of x-rays. Other shells like the M, L, and N shells have lower binding energies and, consequently, produce photons of lower energy when ejected or transitioning occurs. This characteristic makes the K-shell the source of the highest-energy x-rays in typical radiographic procedures.