Alexander Litvinenko, a renegade Russian security officer living in London, was killed by poisoning with polonium, a rare radioactive substance, in 2006.

居住在伦敦的叛逃俄罗斯安全情报官员亚历山大·利特维年科在2006年被一种稀有辐射性物质钚投毒暗杀。

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If most of their dopamine receptors were free, on the other hand, the radioactive substance would bind to them.

从另一方面来说，如果大多数的巴多胺感受器处于空闲，那么放射性物质将会继续依附其上。

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Or a radioactive substance may be disintegrating at a known rate and we may be required to determine the amount of material present after a given time.

又如，某种放射性物质可能正在以已知的速度进行衰变，需要我们确定在给定的时间后遗留物质的总量。

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Mr Litvinenko died in 2006 after he was apparently poisoned with the radioactive substance polonium-210.

BBC: Alexander Litvinenko murder was 'London nuclear terror'

Tritium is a radioactive substance produced by the reactors from nuclear-powered submarines based at the Devonport yard.

BBC: Tritium is released from submarine reactors

Meanwhile, Japan's recall of Meiji baby formula because of pollution by a radioactive substance has also raised a lot of concern.

BBC: China morning round-up: WTO membership marked