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| style="width: 50%;"|''Terrestial radiation'' comes from the Earth: everything is naturally radioactive, including rock, soil, water, air, animals, plants, and food. The average [[Absorbed, Equivalent, and Effective Dose | dose]] [[dose]] from terrestial radiation is 2 mSv per year. More than half of this is from radon in your home.
[[Cosmic Radiation in Aviation | ''Cosmic radiation'']] comes from the Sun and outer space. The average [[Absorbed, Equivalent, and Effective Dose | dose]] from cosmic radiation is 0.4 mSv per year.
