Police suspect that Litvinenko was poisoned at the Millennium Hotel on November 1 and that the polonium, most likely dissolved in some kind of tasteless liquid solution, was slipped into his tea before or during his meeting with the Russian businessmen.The polonium-210 lined Litvinenko's gastrointestinal tract. From there, it seeped into his bloodstream and spread throughout his body, first targeting rapidly dividing cells-hair, skin, stomach, bone marrow. He probably received a much larger dose than was strictly needed to kill him, somewhere between one and 10 gigabecquerels. (A becquerel is a measure of radioactivity amounting to one alpha-particle emission per second. Ten gigabecquerels, the maximum suspected dose, would have delivered 10 billion alpha emissions per second.) The amount was so great, he had no hope of survival. Litvinenko is the first person known to have died of polonium-210 exposure, and the first murdered with it.