Plutonium Isotopes Plutonium Isotopes http://www.globalsecurity.org/wmd/intro/pu-isotope.htm http://www.globalsecurity.org/wmd/intro/pu-isotope.htm http://www.globalsecurity.org/wmd/intro/pu-isotope.htm http://www.globalsecurity.org/wmd/intro/pu-isotope.htm http://www.globalsecurity.org/wmd/intro/pu-isotope.htm