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There is also the possibility of 244 Cm being produced as the double beta decay daughter of natural 244 Pu. [46] [49] Curium is made artificially in small amounts for research purposes. It also occurs as one of the waste products in spent nuclear fuel. [50] [51] Curium is present in nature in some areas used for nuclear weapons testing. [52]
Curium (96 Cm) is an artificial element with an atomic number of 96. Because it is an artificial element, a standard atomic weight cannot be given, and it has no stable isotopes. The first isotope synthesized was 242 Cm in 1944, which has 146 neutrons. There are 19 known radioisotopes ranging from 233 Cm to 251 Cm. There are also ten known ...
americium-241 to curium-242 to curium-243 (or, more likely, curium-242 decays to plutonium-238, which also requires one additional neutron to reach a fissile nuclide) Since these require a total of 3 or 4 thermal neutrons to eventually fission, and a thermal neutron fission generates only about 2 to 3 neutrons, these nuclides represent a net ...
The most important isotopes of these elements in spent nuclear fuel are neptunium-237, americium-241, americium-243, curium-242 through -248, and californium-249 through -252. Plutonium and the minor actinides will be responsible for the bulk of the radiotoxicity and heat generation of spent nuclear fuel in the long term (300 to 20,000 years in ...
The newest exhibit of the Savannah River Site Museum, "Defense, Deterrence and Discovery," tells the story of how these elements, tritium and heavy water were produced at the site located 20 miles ...
Fission product yields by mass for thermal neutron fission of U-235 and Pu-239 (the two typical of current nuclear power reactors) and U-233 (used in the thorium cycle). This page discusses each of the main elements in the mixture of fission products produced by nuclear fission of the common nuclear fuels uranium and plutonium.
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The second isotope 242 Am was produced upon neutron bombardment of the already-created 241 Am. Upon rapid β-decay, 242 Am converts into the isotope of curium 242 Cm (which had been discovered previously). The half-life of this decay was initially determined at 17 hours, which was close to the presently accepted value of 16.02 h.