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Each year, an average person in the United States is exposed to a radiation level of 360 mrem, which is the whole body equivalent dose from the background sources. Most of the radiation is the result from the natural sources. However, this value is also an indication of radiation caused by non-natural sources.
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 Every year, the average person in the United States receives or is exposed to about 360 mrem of radiation.

To add, radiation is the emission of energy as electromagnetic waves or as moving subatomic particles, especially high-energy particles that cause ionization.