Which of the following describes a photoelectric interaction?

The correct response highlights a crucial aspect of the photoelectric interaction, which is defined as the absorption of energy from an incoming photon by an electron in an atom. When a photon interacts with an atom, it can transfer enough energy to overcome the binding energy of an electron, resulting in the ejection of that electron from its orbit. This process not only removes the electron from the atom, but it also results in the ionization of the atom, as it now has a positive charge due to the loss of a negatively charged electron.

This interaction is significant in medical imaging and radiation therapy, as it influences how radiation interacts with tissues, leading to absorption and consequent biological effects. In essence, the fundamental concept underlying the photoelectric effect is the transformation of photonic energy into kinetic energy of an electron, which is precisely what option B describes. Understanding this interaction is essential for appreciating the underlying principles of radiological techniques and the interactions of radiation with matter.