|CT scan, full body|
|CT scan, chest or pelvis|
|Natural background radiation (from sunlight, radon gas, etc.) from living in high-altitude cities (e.g., Denver, Salt Lake City)|
6 mSv (per year)
|Natural background radiation from living at sea level (e.g., Chicago)|
3 mSv (per year)
|High-mileage frequent flying (100,000–450,000 miles per year)|
|X-ray of chest (or ankle to look for broken bones)|
|DEXA (bone-density) scan|
|Dental X-ray (bitewing)|
|Single airplane flight, coast-to-coast|
How Much Radiation Are You Getting?
We absorb radiation from a variety of sources. How much is too much? Experts say 3 mSv per year is probably OK for most of us; 20 mSv for those who must have medical tests.
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