Sources of Radiation Exposureto the US Population

• Assumes average indoor radon concentration of 1.3 pCi/L.

• Radon is by far the greatest single source of radiation to the general public.

Radon

55%

Medical X-Rays

11%

Other

1%

Internal

11%

Nuclear Medicine

4%

Consumer Products

3%

Terrestrial

8%

Cosmic

8%

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