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Average annual effective dose/person received in 1980 (left panel) and 2006 (right panel) in the United States. The large increase in the use of ionizing radiation for medical purposes, in the period 1980–2006, contributed to a total increase from 3.0 mSv in 1980 to 6.2 mSv in 2006. Similar trends are observed in other industrialized countries (51).
