核电站使用的钚239半衰期长达2万4千年，这也就意味着今天从福岛泄漏的物质将在今后几千年内对当地造成影响.

Nuclear plants use Plutonium-239, which has a chemical half-life of 24, 000 years, meaning anything leaked from Fukushima today will still affect the area for thousands of years to come.

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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。

Nuclear fission can only occur in some types of heavy and unstable nuclei such as in the uranium -235 and plutonium -239.

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