Estimates of average annual dose equivalent to the whole body from various sources of irradiation received by members of the U.S. population

Table
Estimates of average annual dose equivalent to the whole body from various sources of irradiation received by members of the U.S. population
source of radiation average dose rates (mSv/year)
Natural
environmental
cosmic radiation 0.27 (0.27–1.30)*
terrestrial radiation 0.28 (0.30–1.15)**
internal radioactive isotopes 0.36
subtotal 0.91
Man-made
environmental
technologically enhanced 0.04
global fallout 0.04
nuclear power 0.002
medical
diagnostic 0.78
radiopharmaceuticals 0.14
occupational 0.01
miscellaneous 0.05
subtotal 1.06
total 1.97
*Values in parentheses indicate range over which average levels for different states vary with elevation.
**Range of variation (shown in parentheses) attributable largely to geographic differences in the content of potassium-40, radium, thorium, and uranium in the Earth's crust.
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Universalium. 2010.

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