Some experts have questioned whether Arafat could have died of polonium poisoning, pointing to a brief recovery during his illness which is not consistent with radioactive exposure. They also noted he did not lose all of his hair.
But Professor David Barclay said neither fact was inconsistent with the findings.
Since polonium loses 50% of its radioactivity every four months, the traces in Arafat's corpse would have faded so far as to have become untraceable if the tests had been conducted a couple of years later, Professor Barclay said.
More top news
Disneyland visitors got more than they bargained for when Johnny Depp popped up partway through the Pirates of the Caribbean ride.
United Airlines has reached an undisclosed settlement with a passenger who was dragged off one of its flights.
F1's governing body was paid $5 million after it signed a contract with the sport which favours the top teams, ITV News has discovered.