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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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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