An Italian contact of poisoned former Russian spy Alexander Litvinenko said he believed both were targeted with a radioactive substance because of secrets they shared.

Mario Scaramella said on Saturday urine tests showed he had received a potentially lethal dose of polonium 210 the rare radioactive isotope that killed Litvinenko and "dangerous concentrations" of polonium would stay in his body for months.

"I have reason to believe that the poisoning of myself and Litvinenko may be connected to information that Litvinenko himself, for months, had transmitted to me," Scaramella said in a statement published by Italian media.

He did not accuse anyone of the poisoning or specify what kind of information Litvinenko had sent him.

Scaramella's dosage of polonium was significantly lower than that of Litvinenko but still considered "potentially lethal and, therefore, capable of killing me," he said.

Litvinenko's mysterious poisoning has sparked a public health scare and strained London's relations with Moscow.

From his deathbed, Litvinenko accused Russian President Vladimir Putin of ordering his slow and agonising death.

The Kremlin denies any involvement and has promised full co-operation with the British investigation. Other theories have centred on the possible involvement of rogue Russian agents.

Scaramella said he felt well and had no symptoms of radiation sickness. But he said he would have to remain under strict medical supervision for months.

He said he was not suspected of killing Litvinenko and London police regarded him as a victim. "I hope to survive to be able to deny all of the defamation, written and spoken, against me," he said.

The London hospital treating Scaramella said he was well and initial tests showed no evidence of radiation sickness.

But Italian Senator Paolo Guzzanti, who spoke to Scaramella by phone, said health officials had told Scaramella the dose of polonium he had received is usually fatal.

"They also said so far, nobody could ever survive this poison, so it is very unlikely he could. But, if he doesn't collapse in three months, there is a kind of hope ... They said that every six months ... the radioactivity decreases by half," he said.

Scaramella, a KGB expert, met Litvinenko at a London sushi restaurant on November 1, the day the Russian fell ill, to show him e-mails from a source warning their lives might be in danger.

Officials said a female relative of Litvinenko reported to be his widow Marina also had traces of polonium 210 in her urine. They said she was not in short-term danger and any long-term risk was likely to be small.

Source: China Daily