Which interaction poses a radiation hazard to personnel in radiography?

• A. Photoelectric effect
• B. Compton scatter
• C. Rayleigh scatter
• D. No interaction

Answer: (B)

In radiography, the interaction that poses a significant radiation hazard to personnel is the Compton scatter. This interaction occurs when x-ray photons collide with loosely bound outer-shell electrons in the atoms of the body or in surrounding materials, such as air or the walls of the radiography room. During this process, the x-ray photon transfers a portion of its energy to the electron, causing the electron to become ejected from its atom. The photon is then scattered at a lower energy and in a different direction.

Compton scatter is particularly concerning for personnel because it generates secondary radiation that can expose radiographers and other medical staff to unnecessary doses of ionizing radiation. This scattered radiation can travel in various directions within the radiography environment, which makes it difficult for personnel to avoid exposure.

In contrast, the photoelectric effect primarily results in the absorption of the x-ray photon by the tissues, which does not contribute to scattered radiation. Rayleigh scatter, on the other hand, involves the elastic scattering of x-ray photons without energy loss, resulting in minimal radiation hazard. The option indicating "no interaction" does not pose any hazard at all, as it implies that the x-ray photons do not interact with matter. Thus, in the context of radiography, Com