High Quality Content by WIKIPEDIA articles! High Quality Content by WIKIPEDIA articles! Background radiation is constantly present in the environment and is emitted from a variety of natural and artificial sources.Natural background radiation comes from two primary sources: cosmic radiation and terrestrial sources. The worldwide average background dose for a human being is about 2.4 millisievert (mSv) per year. This exposure is mostly from cosmic radiation and natural radionuclide in the environment. This is far greater than human-caused background radiation exposure, which in the year 2000 amounted to an average of about 5 Sv per year from historical nuclear weapons testing, nuclear power accidents and nuclear industry operation combined, and is greater than the average exposure from medical tests, which ranges from 0.04 to 1 mSv per year. Older coal-fired power plants without effective fly ash capture are one of the largest sources of human-caused background radiation exposure.

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