What type of radiation exposure is considered external exposure?

External exposure to radiation refers to any radiation that comes from a source outside of the body. This type of exposure occurs when an individual is in the vicinity of radioactive materials or radiation-emitting devices, and the radiation penetrates the body from the external environment.

Choosing the correct answer highlights the fundamental distinction that external exposure involves sources not in direct contact with or inside the body. For instance, being near a radioactive substance or an x-ray machine would constitute external exposure.

Other options pertain to internal exposure, which involves radiation that is ingested, inhaled, or encountered through contaminated surfaces, leading to the absorption of radioactive material into the body. This differentiates them from external exposure, emphasizing the importance of recognizing how radiation can affect individuals from various sources.