Linkek http://www.walter-fendt.de/ph14e/decayseries.htm http://www.walter-fendt.de/ph14e/lawdecay.htm http://www.sikh-history.com/education/physics/rad.html http://www.safety.ubc.ca/rad/calc/calcframe.htm http://www.exploratorium.edu/snacks/radioactive_decay.html http://hyperphysics.phy-astr.gsu.edu/hbase/nuclear/radact.html
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