| 单词 | uranium 238 |
| 例句 | Ordinary low-enriched uranium fuel contains primarily uranium 238, the most common natural isotope of the element, along with about 5 percent uranium 235, a rarer isotope that splits, or fissions, more readily. MOX Battle: Mixed Oxide Nuclear Fuel Raises Safety Questions 2011-03-25T20:46:17.520Z But some of the neutrons do not hit uranium 235 atoms; they hit a different form of uranium present in the reactor, uranium 238. Bridging 2 Kinds of Reactors 2010-06-23T13:30:00Z TerraPower’s design is for a reactor that starts with a small quantity of uranium 235, the type that splits easily, and a large amount of uranium 238, which is plentiful but hard to use. Slide Rule Cedes to 'the Traveling Wave' 2010-06-16T15:02:00Z When the reactor begins operating and throwing off neutrons, some of those would be captured by the uranium 238 and would then be transmuted into plutonium 239, a good reactor fuel. TerraPower Gets $35 Million Investment 2010-06-15T03:10:00Z Four years ago, Iran began enriching uranium on an industrial scale with centrifuges, machines that spin extraordinarily fast to separate uranium 235 from the more common form of the element, uranium 238. For Iran, Enriching Uranium Only Gets Easier 2010-03-08T23:06:00Z He rode with a long train of bubbs and great sheaves of smelted metal rods—tungsten, osmium, uranium 238. The Planet Strappers The uranium 238 then captures the neutron and is transformed into a new element, plutonium 239, which is also fuel. Bridging 2 Kinds of Reactors 2010-06-23T13:30:00Z Yet some of the neutrons strike atoms of uranium 238 and are absorbed, transmuting the uranium into plutonium 239, which is also a good reactor fuel. Slide Rule Cedes to 'the Traveling Wave' 2010-06-16T15:02:00Z The United States used reactors to convert uranium 238 into plutonium 239 in making the bomb that it dropped on Nagasaki in 1945; that is also how North Korea built its bomb in recent years. Bridging 2 Kinds of Reactors 2010-06-23T13:30:00Z By using up most of the uranium 238, the new design will get 40 times more energy from each pound of uranium, TerraPower says. Slide Rule Cedes to 'the Traveling Wave' 2010-06-16T15:02:00Z |
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