We are constantly exposed to radiation from natural sources such as rocks, soil and the atmosphere. Americans receive about 3 millisieverts (mSv) of naturally occurring radiation annually. A mSv is a standard unit of radiation measurement.

Select an exam to find out how our radiation dose compares to the national average.

- 3 mSv is the average American's annual exposure to background radiation
- The mSv for exams at Mass General are estimates that represent the average dose based on population data
- National averages are from the National Radiology Data Registry maintained by the American College of Radiology


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