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Hence the high price of curium, which has been quoted at 160–185 USD per milligram, [13] with a more recent estimate at US$2,000/g for 242 Cm and US$170/g for 244 Cm. [57] In nuclear reactors, curium is formed from 238 U in a series of nuclear reactions.
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 ...
curium-235: 5 300 lead-193: 5 300 bismuth-197m1: 5.04 302 bismuth-196: 5.1 310 polonium-199: 5.48 329 neptunium-242m: 5.5 330 radon-206: 5.67 340 titanium-51: 5.76 346 lead-193m1: 5.8 350 bismuth-216m: 6.6 400 curium-236: 6.8 410 berkelium-242: 7.0 420 bismuth-212m2: 7.0 420 thorium-235: 7.2 430 neptunium-240m: 7.22 433 astatine-203: 7.37 442 ...
246 Cm ƒ: 243 Am ƒ: 4.7–7.4 ka 245 Cm ƒ: 250 Cm 8.3–8.5 ka 239 Pu ƒ: 24.1 ka 230 Th № 231 Pa № 32–76 ka 236 Np ƒ: 233 U ƒ: 234 U № 150–250 ka: 99 Tc ₡ 126 Sn 248 Cm 242 Pu 327–375 ka: 79 Se ₡ 1.33 Ma: 135 Cs ₡ 237 Np ƒ: 1.61–6.5 Ma: 93 Zr 107 Pd 236 U 247 Cm ƒ: 15–24 Ma: 129 I ₡ 244 Pu 80 Ma ... nor beyond 15 ...
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 ...
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 ...
Global shortages of nuclear chemical needed for cancer scans will see patients’ appointments cancelled, minister warns
Even then, there is a chance either of those two fissile isotopes will fail to fission but instead absorb a fourth neutron, becoming curium-246 (on the way to even heavier actinides like californium, which is a neutron emitter by spontaneous fission and difficult to handle) or becoming 242 Pu again; so the mean number of neutrons absorbed ...