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。

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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。

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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。

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The new molecule, a uranium 235 atom surrounded by just five fluorine atoms, is no longer a gas.

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For uranium to work in a nuclear reactor it must be enriched to contain 2-3% uranium-235 while weapons-grade uranium must contain 90% or more uranium-235.

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Uranium 235 is the key material in starting a nuclear reaction, and its acquisition is the main problem facing states which want to go nuclear.

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