What is the typical range for the average annual background radiation dose received by individuals in the United States?

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Multiple Choice

What is the typical range for the average annual background radiation dose received by individuals in the United States?

Background radiation from natural sources in the United States accumulates from cosmic rays, terrestrial materials, and internal radionuclides, giving a typical annual dose of a few millisieverts. In radiology units, 1 rad is about 0.01 Gy, and for gamma exposure 1 Gy equals 1 Sv, so 1 rad corresponds to about 10 mSv. Therefore, 1 mrad equals about 0.01 mSv. The range 150 to 300 mrad per year converts to roughly 1.5 to 3.0 mSv/year, which matches the commonly cited average US background dose. Other ranges would be lower or higher than the usual annual background exposure.

Background radiation from natural sources in the United States accumulates from cosmic rays, terrestrial materials, and internal radionuclides, giving a typical annual dose of a few millisieverts. In radiology units, 1 rad is about 0.01 Gy, and for gamma exposure 1 Gy equals 1 Sv, so 1 rad corresponds to about 10 mSv. Therefore, 1 mrad equals about 0.01 mSv. The range 150 to 300 mrad per year converts to roughly 1.5 to 3.0 mSv/year, which matches the commonly cited average US background dose. Other ranges would be lower or higher than the usual annual background exposure.

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