What is the average annual equivalent dose (AED) received from natural background radiation?

The average annual equivalent dose (AED) from natural background radiation is typically in the range of 2 to 3 mSv. This estimate considers exposure from various sources, including cosmic rays, radon gas, and terrestrial radiation, all of which contribute to the overall radiation dose that individuals receive without any artificial sources.

Natural background radiation varies based on geographic location and elevation; however, on a global scale, research indicates that the average dose falls within this range. The values reflect a combination of terrestrial sources such as uranium and thorium in the earth's crust, cosmic radiation that penetrates the atmosphere, and indoor radon levels, which significantly contribute to individual exposure levels.

Understanding the average background radiation dose is crucial in the field of medical dosimetry, as it sets a baseline for evaluating the additional doses received from medical procedures, leading to better safety protocols and patient guidelines.