but paul joyal knew what it was and what it could do.burned to death from redo activity. >> it's a horrible death. it's a gruesome death. he lived longer than any man normally would under those circumstances. and he lived just long enough, within 12 hours long enough, for them to finally determine that it was polonium, for something else. why if he had died 12 hours earlier wouldn't have made a difference? >> because they wouldn't have found out. they would've marked the death certificate, as death unknown. unknown, unknown assailants, turn the page, move on. them >> it's a key of this murder. polonium 210 was discovered. and now we exactly know what so she was killed by polonium 210. >> it's an almost perfect murder weapon. polonium has no smell, little taste, and without specialized equipment, it's undetectable. the amount that killed litvinenko slipped into something he ate or drank, was no larger than a grain of salt. that still 1000 times the lethal dose. and that tiny bit of polonium would've been enormously expensive. >> eight to