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Radiation
According to the United Nations (UNSCEAR), regular nuclear power plant operations, including the nuclear fuel cycle, globally increases the amount of absorbed dose per person by 0.0002 millisievert per year (mSv/a) on average. The average dose from operating nuclear power plants to the local populations around them is less than 0.0001 mSv/a. For comparison, the average variation in a person's absorbed natural background radiation is 2.4 mSv/a globally. It varies between 1 mSv/a and 13 mSv/a, mostly determined by the geology of the location. The average dose to those living within 50 miles of a coal power plant is over three times this dose, 0.0003 mSv/a.

As of a 2008 report, Chernobyl resulted in the most affected surrounding populations and male recovery personnel receiving an average initial 50 to 100 mSv over a few hours to weeks, while the remaining global legacy of the worst nuclear power plant accident in average exposure is 0.002 mSv/a and is continually dropping at the decaying rate, from the initial high of 0.04 mSv per person averaged over the entire populace of the Northern Hemisphere in the year of the accident in 1986.