Radium is a radioactive element.

镭是一种放射性元素。

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Radioactive Element Detected Near Nuclear plant.

核电站附近发现辐射性元素。

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This radioactive element has a half-life of some 5, 700 years.

这种放射性元素半衰期约为5700年。

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They had been interested in thorium -- a radioactive element that can fuel nuclear reactors but not be processed into weapons.

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World War Two ended. Enrico Fermi had been the first to use a neutron to produce the radioactive change of one element to another.

VOA: special.2009.06.14

When the Sun becomes more active, this isotope becomes more abundant along with beryllium, another radioactive element.

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Litvinenko wound up dead in London from poisoning with an exotic, highly radioactive element called Polonium 210 widely believed to have come from Russia.

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IAEA-led team was fanning out in western Georgia in search of the remaining two of a batch of eight abandoned devices containing strontium-90, another radioactive element, which had been used in generators for communication stations.

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