![]() ![]() ^ Bold italics symbol as daughter – Daughter product is nearly stable.^ # – Atomic mass marked #: value and uncertainty derived not from purely experimental data, but at least partly from trends from the Mass Surface (TMS).^ ( ) – Uncertainty (1 σ) is given in concise form in parentheses after the corresponding last digits.6 240Pu as an obstacle to nuclear weapons.The primary decay products before 244Pu are isotopes of uranium and neptunium (not considering fission products), and the primary decay products after are isotopes of americium. The primary decay modes before the most stable isotope, 244Pu, are spontaneous fission and alpha emission the primary mode after is beta emission. The isotopes of plutonium range in atomic weight from 228.0387 u ( 228Pu) to 247.074 u ( 247Pu). This element also has eight meta states all have half-lives of less than one second. All of the remaining radioactive isotopes have half-lives that are less than 7,000 years. The most stable are plutonium-244 with a half-life of 80.8 million years, plutonium-242 with a half-life of 373,300 years, and plutonium-239 with a half-life of 24,110 years. ![]() Twenty plutonium radioisotopes have been characterized. ![]() It was synthesized long before being found in nature, the first isotope synthesized being 238Pu in 1940. Like all artificial elements, it has no stable isotopes. Plutonium ( 94Pu) is an artificial element, except for trace quantities resulting from neutron capture by uranium, and thus a standard atomic weight cannot be given. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |