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A little wonder, every day

Natural background averages about 2.4 mSv per year

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Historical milestones sometimes have different dates.

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People constantly receive small doses of ionizing radiation from natural sources, including radon, soil, food, and cosmic rays. The UN Scientific Committee estimates the worldwide average annual dose from natural background at about 2.4 millisieverts (mSv), or 240 millirem. Actual doses vary by location and living conditions.