Answer to Question #36450 in Atomic and Nuclear Physics for kaira
About 3% of background radiation comes from man-made sources, such as global contamination from weapons testing, power generation, medical uses, and burning fossil fuels. As for its significance, that is debatable. The average dose of radiation exposure is 3.6 millisievert per year.
As a comparison, a typical X-ray gives you a dose of about 0.02 to 0.2 millisievert. Many biologists actually consider small amounts of radiation to be healthy for biological organisms and populations in general.
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