Approximately what percentage of an individual's average annual exposure to radiation is associated with artificial sources of radiation?

Name: Approximately what percentage of an individual's average annual exposure to radiation is associated with artificial sources of radiation?
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Approximately 20% of an individual's average annual exposure to radiation is associated with artificial sources of radiation, such as medical imaging, nuclear power plants, and consumer products.

Approximately What Percentage of an Individual's Average Annual Exposure to Radiation