What does Linear Energy Transfer (LET) refer to in the context of radiation?

Linear Energy Transfer (LET) refers to the rate at which energy is deposited by ionizing radiation as it travels through a medium, typically measured per unit length of the track of radiation. This concept is crucial in radiation physics and dosimetry because it helps to understand the biological effects of different types of radiation. Radiation with high LET, such as alpha particles, transfers energy more effectively over small distances compared to low LET radiation, like X-rays or gamma rays, which can travel further but deposit less energy per unit length.

Understanding LET is essential for evaluating the potential damage to biological tissues. As such, the correct answer effectively reflects the nuanced way in which energy from radiation is absorbed and its implications for safety and medical applications.