Annual Radiation Exposure - 2009
Based on data from NCRP Report No. 160, 2009, with permission of the National Council on Radiation
Protection and Measurements, NCRPonline.org.
Man-Made
50%

^Spac
5%
nternal
5%
3%
Terrestrial
Radon
48%
L
Medical
48%
Natural
(Background)
50%

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