The hotel was one of several locations in London found to have been contaminated. Litvinenko died last month from poisoning with the radioactive isotope polonium-210.
Traces of radiation were also found at locations in Hamburg visited by a Litvinenko contact.
Russian authorities said checks being carried out at Germany's request on planes that flew from Moscow to Hamburg last month have so far shown no traces of contamination.
(compiled from agency reports)
Aleksandr Litvinenko: A Timeline
CLOAK AND DAGGER: A timeline of a murder case that unraveled after Andrei Litvinenko, a former Russian security officer and vocal Kremlin critic, dies on November 23, 2006, of poisoning by radioactive isotope polonium-210.
In a deathbed letter, Litvinenko blames Russian President Vladimir Putin for his death -- a claim Putin condemns.
Investigators center on two meetings in London that Litvinenko had described -- one in which he met with two Russians for tea in London, and another in which he met with a third Russian at a sushi bar.
Six months later, British prosecutors announce they have enough evidence to charge a Russian citizen -- one of the men who had met with Litvinenko for tea -- with the murder ...more...
MORE: Coverage in Russian from RFE/RL's Russian Service.