Alexander Litvinenko, a renegade Russian security officer living in London, was killed by poisoning with polonium, a rare radioactive substance, in 2006.
Madame Curie was the physicist with expertise in chemistry that, in 1898, discovered the radioactive substances of radium and polonium in Paris, France.
The polonium itself, with its rarity and trail of irradiated locations (see article) ought to be a telling clue.
This is because the radioactivity emanating from polonium-210 is in the form of highly energetic alpha particles.
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