Liberal Dictionary English Dictionary
n.
- Relatively constant low-level radiation from environmental sources such as building materials, cosmic rays, and ingested radionucleides in the body.
Low-level radiation at the surface of the Earth that comes from cosmic rays and from small amounts of radioactive materials in rocks and the atmosphere.
What is background radiation? Is background radiation a risk to me
Background Radiation – Mission to Mars
Cyberphysics – Background Radiation