Which of the following is the most penetration beam: (A) Electron beam, (B) 8 MeV Photons, (C) 18 MeV Photons, (D) Proton beam
Answer is C. Penetration power of photons depends on the kinetic energy. higher the kinetic energy of the photon beam,higher will be the penetration power. kVp determines the penetrating power of Xrays.