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FBaggins

(28,705 posts)
13. Happy to help anyway
Fri Jan 10, 2014, 11:27 AM
Jan 2014

Your past swings in being able to assess reality on the subject long ago removed your opinion of me from the list of things I care about.

Here are a couple authoritative sources:

http://hps.org/documents/environmental_radiation_fact_sheet.pdf

http://www.ncrppublications.org/Reports/160

The second source is expensive, but the piece you're looking for is summarized in the USA column of the wikipedia entry:
http://en.wikipedia.org/wiki/Background_radiation

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