What is the majority of the x-ray photons in an x-ray beam classified as?

• A. Discrete radiation
• B. Characteristic radiation
• C. Bremsstrahlung radiation
• D. Charged particle radiation

Answer: (C)

In x-ray production, the majority of photons come from Bremsstrahlung radiation, which occurs when high-energy electrons are decelerated by the electric field of the target nucleus. This deceleration emits photons across a wide range of energies, producing a continuous spectrum that extends up to the tube’s maximum energy. Characteristic radiation arises from inner-shell electrons being ejected and the atom relaxing, giving photons with specific, discrete energies, and these events are less frequent. Because there are far more deceleration interactions than inner-shell transitions, most photons in the beam are Bremsstrahlung.