Which statement is true regarding the accompanying animation about x-ray interactions?

Which statement is true regarding the accompanying animation about x-ray interactions?

• A. Occurs with low energy photons
• B. Electron is absorbed by tungsten atom
• C. Photon ejects outer shell electron
• D. Accounts for absorbed dose

Answer: (A)

The animation illustrates the photoelectric interaction, where a photon is completely absorbed by a high‑Z atom (like tungsten) and an inner-shell electron is ejected. This process is most likely at relatively low photon energies, which is why the statement that this occurs with low-energy photons is the true one. The other options don’t fit this picture: the electron isn’t just absorbed by the atom, and it’s typically an inner-shell electron that is ejected—not from the outer shell. While energy from the interaction does contribute to absorbed dose, the animation is highlighting the specific interaction itself, not dose accounting.

The animation illustrates the photoelectric interaction, where a photon is completely absorbed by a high‑Z atom (like tungsten) and an inner-shell electron is ejected. This process is most likely at relatively low photon energies, which is why the statement that this occurs with low-energy photons is the true one. The other options don’t fit this picture: the electron isn’t just absorbed by the atom, and it’s typically an inner-shell electron that is ejected—not from the outer shell. While energy from the interaction does contribute to absorbed dose, the animation is highlighting the specific interaction itself, not dose accounting.