| 单词 | uranium 235 |
| 例句 | By December 6, the spectrographers had accumulated their first measurable, if invisible, quantity of uranium 235—far from pure but at more than triple the concentration found in nature. Big Science 2015-07-07T00:00:00Z This is especially true if your fission system relies on highly enriched uranium—that is, uranium composed of 20 percent or more of the fissile isotope uranium 235. NASA’s ‘Nuclear Option’ May Be Crucial for Getting Humans to Mars 2022-01-27T05:00:00Z The Iranian images of the plant released last year show the assembly of the centrifuges — tall, thin machines that enrich, or concentrate, uranium’s rare component, uranium 235. Mysterious explosion, fire damage Iranian nuclear enrichment facility 2020-07-02T04:00:00Z The deal allows research, which now has improved their breakout time down to a day or two, by means of rapid centrifuge enrichment of uranium 235. U.S. Taking Negotiations ‘One Week at a Time’ on Expiring Iran Deal 2018-03-21T04:00:00Z If Iran were to enrich this material further, to the point at which 90 percent of it was uranium 235, it would provide the core of four nuclear bombs. How Close Is Iran to Exploding Its First Nuclear Bomb? 2012-05-30T11:15:00.227Z Compared weight-by-weight, uranium 235 delivers a million times more energy than coal, which itself already represents chemical energy in a highly concentrated form. The Smart Way to Play God with Earth's Limited Land 2012-01-20T22:15:00.427Z The more uranium 235 your nuclear fuel has, the smaller you can make your reactor—or your bomb, which is why the material is subject to such strict regulations. NASA’s ‘Nuclear Option’ May Be Crucial for Getting Humans to Mars 2022-01-27T05:00:00Z The desert complex Natanz raises the level of uranium 235 from the natural concentration of 0.7 percent in mined ore to roughly 4 percent — a level suitable for nuclear reactors. Iranian Plant Is Enriching Uranium, Inspectors Confirm 2012-01-10T03:17:21Z Lawmakers set the budget at 235 million yen after uranium 235, a fuel used in atomic reactors, according to his autobiography. Tepco’s ‘Deal With Devil’ Signals End to Japan’s Postwar Era 2011-10-20T15:23:05Z The scarce isotope, known as uranium 235, amounts to just 0.7 percent of mined uranium. Laser Advances in Nuclear Fuel Stir Terror Fear 2011-08-21T00:34:41Z 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 The government increased the proportion of uranium 235, the kind that splits easily in reactors. Fresh Capital in the Uranium Fuel Race 2010-09-07T12:26:00Z Because uranium enrichment becomes much easier as it goes from low to high concentrations, weapons experts consider that very close to bomb-grade fuel, where the concentrations of uranium 235 are raised to around 90 percent. Iranian Plant Is Enriching Uranium, Inspectors Confirm 2012-01-10T03:17:21Z 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 For instance, because weapons-grade plutonium fissions more readily than uranium 235, reactors may need more robust control rods—neutron absorbers that shut down the nuclear chain reaction when inserted into a reactor's core. MOX Battle: Mixed Oxide Nuclear Fuel Raises Safety Questions 2011-03-25T20:46:17.520Z Its fuel is 93 percent uranium 235 — the high-purity uranium it takes to energize an atom bomb and exactly what the West fears that Tehran wants to produce. Research Reactors Pose Challenge in Push for Nuclear Safety 2010-04-12T20:49:00Z Reactor-grade fuel is usually defined as uranium 235 of about 4 or 5 percent, and bomb-grade as 90 percent or higher. For Iran, Enriching Uranium Only Gets Easier 2010-03-08T23:06:00Z The isotope, known as tech 99m, is a product of the rapid decay of another radioactive isotope, molybdenum 99, which is itself produced by splitting atoms of uranium 235. 2010-02-16T19:11:00Z A considerable fraction of the mass of the explosive charge, which may be uranium 235 or plutonium, is transformed into energy. The Atomic Bombings of Hiroshima and Nagasaki MOX fuel, on the other hand, substitutes plutonium 239 as the fissionable component, reducing the need for uranium 235. MOX Battle: Mixed Oxide Nuclear Fuel Raises Safety Questions 2011-03-25T20:46:17.520Z 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 The desert complex, the Natanz nuclear facility, raised the level of uranium 235 to roughly 4 percent from its natural concentration of 0.7 percent. For Iran, Enriching Uranium Only Gets Easier 2010-03-08T23:06:00Z |
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