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.

他们当时对一种放射性元素钍很感兴趣，这种元素能驱动核反应堆，却不能制造生产成武器。

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The undisputed link between the tests and a radioactive element in baby teeth provided much of the impetus for the 1963 test Ban Treaty, which outlawed above-ground nuclear weapons-testing.

试验与婴儿牙齿里放射元素之间的无可争辩的联系对于推动1963年的《禁止核试验条约》起了至关重要的作用。该条约宣布地面进行核武器试验非法。

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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

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

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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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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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