http://en.wikipedia.org/wiki/Radioactive_decayhttp://hyperphysics.phy-astr.gsu.edu/hbase/nuclear/radact.htmlhttp://www2.lbl.gov/abc/wallchart/chapters/03/0.htmlhttp://chemistry.about.com/od/chemistryfaqs/f/radioactivity.htmhttp://www.britannica.com/EBchecked/topic/489089/radioactivity
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