作为Masurium，它是在自然界中发现的第一种只能通过自然裂变产生的元素；作为锝，它是在实验室中发现的第一种元素。
As Masurium, it was the first element discovered that occurs in nature only from spontaneous fission, and as Technetium, it was the first element discovered in a laboratory.
这些放射性元素为核电站裂变发电时的副产品。
These radioactive elements are by-products of the fission reaction that generates power in the nuclear plants.
然后其余的铀后元素被转移到燃烧炉中裂变为更稳定的材料。
Then the remaining transuranics would be transferred to a burner to be fissioned into more stable materials.
但是约有百分之五的反应堆废料是高放射性裂变产物，包括钚和其他锕系元素。
But roughly 5 percent of reactor waste is highly radioactive fission products, including plutonium and other actinides.
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。
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。
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.
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