Background radiation

Background radiation is a measure of the level of ionizing radiation present in the environment at a given location that is not due to the intentional introduction of radiation sources.

Background radiation comes from a variety of sources, both natural and man-made. These include both cosmic radiation and environmental radioactivity from naturally occurring radioactive materials (such as radon and radium), as well as man-made medical X-rays, fallout from nuclear weapons testing, and nuclear accidents.

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