• British officials are still puzzled by the use of this poison, the radioactive isotope Polonium 210.

    NPR: Radioactive Poison as an Assassin's Tool

  • Mr Litvinenko died in 2006 after he was apparently poisoned with the radioactive substance polonium-210.

    BBC: Alexander Litvinenko murder was 'London nuclear terror'

  • Prosecutor General Yuri Chaika told reporters Tuesday that it's nonsense to assume the rare polonium-210 isotope came from Russia.

    NPR: U.K. Investigators Visit Moscow in Litvinenko Probe

  • Doctors have also found low levels of polonium-210 in Scaramella's system, though he said he did not feel ill.

    CNN: Scaramella: I warned poisoned spy

  • Alexander Litvinenko, a renegade Russian security officer living in London, was killed by poisoning with polonium, a rare radioactive substance, in 2006.

    ECONOMIST: Assassinations and technology

  • Litvinenko died Nov. 23 in a London hospital after ingesting radioactive polonium-210.

    NPR: Kremlin Issues Warning After Expulsions

  • Traces of polonium-210 were found at around a dozen other sites in London, including three hotels, a stadium, two planes and an office building.

    NPR: Kremlin Issues Warning After Expulsions

  • That is the formula the report applies, for example, to Iran's explanation for having conducted research on polonium-210, which can be useful for triggering nuclear weapons.

    ECONOMIST: Nuclear proliferation

  • On that day Litvinenko fell sick, suffering (it eventually turned out) the effects of poisoning by polonium, a rare radioactive substance that killed him three weeks later.

    ECONOMIST: British prosecutors name their man

  • And Mr. Lugovoi, he gave an interview yesterday actually in Moscow, where he denied involvement again and in fact said he was a victim himself of polonium poisoning.

    NPR: British Prosecutors to Receive Russian Spy Case

  • Russian investigators have appeared recalcitrant in the Livtinenko case, and the government has refused to extradite the polonium suspect, Andrei Lugovoi, calling it a matter of national sovereignty.

    WSJ: Russia Declares Litvinenko Murder Suspect a Victim

  • He was a friend and close associate of Alexander Litvinenko, the former Russian security agent who died in London in 2006 after drinking tea laced with radioactive polonium.

    WSJ: Boris Berezovsky, Exiled Russian Tycoon, Dies

  • On Wednesday Russia's Investigative Committee said it had also conducted its own probe, and had ascertained that Mr. Lugovoi and a colleague, Dmitry Kovtun, were also exposed to polonium in the restaurant.

    WSJ: Russia Declares Litvinenko Murder Suspect a Victim

  • Mr Berezovsky was a close friend of murdered Russian emigre and former KGB officer Alexander Litvinenko, who died in 2006 after he was poisoned with the radioactive material polonium-210 while drinking tea at a London meeting.

    BBC: UK

  • "We don't have enough information to make any definitive statement, but it does seem a bit of a stretch" to conclude that Arafat was poisoned by polonium-210, he told CNN in a telephone interview last week.

    CNN: STORY HIGHLIGHTS

  • "We have evidence there is too much polonium, but we also have hints from the medical records that this may not be the case, " said Francois Bochud, director of the Institut de Radiophysique in Lausanne, Switzerland.

    CNN: STORY HIGHLIGHTS

  • British police say they have amassed detailed evidence against Mr. Lugovoi, a career security service officer, and tracked a trail of polonium across Europe to his London hotel room and the upscale Mayfair bar where he met with Mr. Litvenenko when he consumed some polonium-laced tea.

    WSJ: Russia Declares Litvinenko Murder Suspect a Victim

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