It's often said that the radiation dose of a chest X-ray is comparable to flying across the continent, Smith-Bindman says, referring to natural radiation exposures at high altitudes. But a CT scan can be comparable to 500 transcontinental flights.
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6 mSv in a year is a typical radiation doses received by aircrew flying long-haul polar routes. For comparison: 3.0 mSv is an average radiation dose per year received by a person from all sources of radiation. This can range from about 1 to 10 mSv, or more, depending on where people live.