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I just wanted to welcome you. it is great to have an expert in an area contributing! I also wanted to tell you that it is customary to put comments on a talk page at the bottom (you can use the "new section" tab). I moved your recent comments over at Talk:Radon#Radon_in_imaging down to the bottom where you will find them (and any future responses). PDBailey (talk) 02:43, 18 September 2009 (UTC)