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Curium is one of the most radioactive isolable elements. Its two most common isotopes 242 Cm and 244 Cm are strong alpha emitters (energy 6 MeV); they have fairly short half-lives, 162.8 days and 18.1 years, and give as much as 120 W/g and 3 W/g of heat, respectively.
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.
A common source of alpha particles is curium-244. It emits particles with an energy of 5.8 MeV. X-rays of 14 and 18 keV are emitted in the decay of plutonium-240. The Mars Exploration Rovers' Athena payload uses curium-244 with a source strength of approximately 30 millicuries (1.1 GBq). [10]
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 ...
That same year, curium-244 was produced as a heat source for space exploration. This was the first full scale conversion of an SRP reactor load to non-weapons materials. R-Reactor and HWCTR were shut down in 1964. In 1965, californium-252, the heaviest isotope produced at SRP, was separated as a byproduct of the curium program. Beginning in ...
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After removal of fuel from reactor, decay will predominate for shorter-lived isotopes such as 238 Pu, 241 Pu, 242–244 Cm; but 245–248 Cm are all long-lived. Fertile material is a material that, although not fissile itself, can be converted into a fissile material by neutron absorption .