MOSCOW, December 19 (RIA Novosti) - Medical experts have detected no traces of polonium on a Russian youth opposition movement head who met with the murdered former Russian security service defector Alexander Litvinenko, the leader said Tuesday.

The leader of the Pora youth movement, Andrei Sidelnikov, said last week that he met with Litvinenko October 30, just two days before the former FSB agent's hospitalization, at a cafe near the Oxford Circus underground station in London, adding that they spoke for nearly two hours.

"Yesterday, I was checked for [radioactive] contamination," Sidelnikov said. "No traces of polonium were found."

Litvinenko died in the hospital November 23 following an alleged deathbed statement implicating Russian President Vladimir Putin in his death. Doctors said a lethal dose of the radioactive substance polonium-210 was the cause of death.

Sidelnikov said he was screened for polonium by experts from the Russian Federal Service for the Oversight of Consumer Protection and Welfare, who asked him to come to the examination in the same clothes he wore the day of his meeting with Litvinenko.

"They [doctors] asked me to do this because they said that particles of polonium remain [on clothes] and cannot be washed away, and that if there were any particles, then sensors would definitely have given out a signal," Sidelnikov said.

The leader of the youth movement said he was ready to talk with Scotland Yard experts investigating Litvinenko's murder, but added that he had no documents that could help the investigation.