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 carbon (C-14)formed by cosmic ray interactions in the atmosp 
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Location: Arkansas
Plants and animals are also naturally radioactive; they contain small (but measurable) levels of radioactive potassium as well as radioactive carbon (C-14) and hydrogen (tritium, or H-3) that are formed by cosmic ray interactions in the atmosphere.

This information is from HPS.org


Wed Mar 13, 2013 8:35 am
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