Airborne Radon
The biggest source of natural background radiation is airborne radon, a radioactive gas that emanates from the ground. Radon and its isotopes, parent radiosondes, and decay products all contribute to an average inhaled dose of 1.26 mSv/a (millilitre per year).
Answer:
The largest source of natural background radiation is airborne radon.
Explanation:
Airborne radon is a radioactive gas that comes from the ground. It can be found in rocks and soils, as well as water. When is escapes the ground, it decays in the air and produces further radioactive particles.
