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plutonium |
2 definitions found From WordNet r 1.6 [wn]: plutonium n : a radioactive transuranic element that is similar to uranium; found in minute quantities in uranium ores but is usually synthesized in nuclear reactors; 13 isotopes are known with the most important being plutonium 239 [syn: {Pu}, {atomic number 94}] From Elements database 20001107 [elements]: plutonium Symbol: Pu Atomic number: 94 Atomic weight: (242) Dense silvery radioactive metallic transuranic element, belongs to the actinoids Pu-244 is the most stable isotope with a half-life of 7.6*10^7 years. Thirteen isotopes are known Pu-239 is the most important, it undergoes nuclear fission with slow neutrons and is hence important to nuclear weapons and reactors. Plutonium production is monitored down to the gram to prevent military misuse. First produced by Gleen T. Seaborg Edwin M. McMillan J.W. Kennedy and A.C. Wahl in 1940.
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