Radium is a radioactive element.

镭是一种放射性元素。

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Radium is a radioactive element.

镭是个放射性元素。

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That essentially means that it uses a radioactive element called americium-241 to spot smoke or harmful gasses.

从字面上可以了解到，它采用放射性元素镅241来探测烟雾或者有害气体。

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

VOA: special.2010.10.15

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

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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The device's primary source of neutron radiation was the radioactive element californium, but the stream of neutrons produced by the californium was multiplied by passing it through a lattice of highly enriched uranium U-235, whose nuclear fission released additional neutrons.

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