polonium poison

Yasser Arafat died in 2004 at age 75. According to some sources, he had been in reasonably good health, when he abruptly took a turn for the worse and died. Rumors circulated that Arafat had met with foul play. Suspicion quickly fell upon Israel, perhaps due to certain government sources...

http://www.breitbart.com/news/2006/11/24/D8LJH9EG0.html Polonium 210 is highly radioactive, producing alphas and little else. But how much would have to have been given to this poor sod to produce these effects? Is it feasible to poison someone this way? Where would a murderer get this?