Uranium 235 — the fuel inside a nuclear reactor — undergoes nuclear fission.
铀235——反应堆中的燃料——经过核裂变。
When you split a uranium 235 atom you will create what we call fission fragments.
当你们将铀235原子分离的时候,你会创造出我们称为裂变碎片的。
Now first of all we're gonna talk about the fundamentals of the neutron capture and what happens in the neutron capture of a uranium 235 atom.
现在，首先我们要谈论，中子捕获的基本原理，在铀235原子的，中子捕获方面发生了什么。
A neutron striking a uranium 235 atom, releasing some gammas and some neutrons, creating two fission fragments which themselves have a distribution of occurrence.
一个撞击铀235原子的中子，释放出一些γ，和一些中子，创造出2个裂变碎片,那它们自己会有出现的分布。
There are different kinds, or isotopes, of uranium, and the type used in nuclear power plants is called uranium-235, because these atoms are easiest to split in two.
铀有许多不同的种类，或称同位素，而在核电站中所使用的是铀235这一类，因为这些的原子最容易一分为二。
To make fuel for electricity-generating reactors, uranium is enriched to less than 5 percent of the isotope U-235.
为将燃料做成电能反应堆，铀被浓缩至U-235同位素含量5%以下。
It is made up of old fuel rods that have become sufficiently depleted of uranium-235, the isotope that drives a reactor’s main chain reaction, to be no longer useful.
乏燃料由完全耗尽铀-235的旧燃料棒组成，核反应堆的链式反应就是由铀-235激发的。
It is necessary to enrich the fuel by increasing the percentage concentration of uranium-235.
必须提高铀235浓度的百分比，使燃料浓集。
Nuclear fission can only occur in some types of heavy and unstable nuclei such as in the uranium -235 and plutonium -239.
核裂变只能在某种类型的重核及不稳定核素内发生，如铀- 235及钚- 239。
The prime example is the element uranium (U), which occurs naturally as two isotopes-the lighter, fissionable U-235 and the heavier, non-fissionable U-238.
铀（U）元素就是一个很好的例子。天然铀有两种同位素；较轻的负235可以裂变，较重的铀238则不会裂变。
In the mid 1940s the process to produce uranium - 235 was scaled up from lab to plant with a scale-up factor of 1061. Obviously this is a big risk, but so were the perceived returns.
40年代中期，生产u- 235的工艺从实验室规模到工厂规模的放大系数是1061显然这是个大冒险，不过也收到了大回报。
In the mid 1940s the process to produce uranium - 235 was scaled up from lab to plant with a scale-up factor of 1061. Obviously this is a big risk, but so were the perceived returns.
40年代中期，生产u- 235的工艺从实验室规模到工厂规模的放大系数是1061显然这是个大冒险，不过也收到了大回报。
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