Plutonium : Dictionary / Wörterbuch (BEOLINGUS, TU Chemnitz)

English Dictionary: Plutonium	by the DICT Development Group
2 results for Plutonium
From WordNet (r) 3.0 (2006) [wn]:
plutonium n a solid silvery grey radioactive transuranic element whose atoms can be split when bombarded with neutrons; 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 Synonym(s): plutonium, Pu, atomic number 94
From The Elements (22Oct97) [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 7.610^7 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.