At 05:39 PM 3/18/2011, Mike Miller wrote: >What's normal? The worldwide average background exposure is about 250 millirems (2.5 millisieverts) a year. People in Denver get about twice that because of the altitude. Various places get more, some a lot more. Granite is radioactive, so is coal and seawater so people in New Hampshire get a slightly higher exposure. A chest or abdomen CT scan delivers somewhat over twice the average yearly background dose, whereas a static chest xray adds only a very tiny dose. Yours, David |
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