how was this ten-million number, determined?
from the article
"United Nuclear Scientific Supplies of New Mexico, one of the few companies licensed to sell polonium-210 isotopes online, said that as a single unit costed (sic) about $US69, it would take at least 15,000 orders, costing more than $US10 million, to kill someone.
"The company said that as it sold to only a handful of outlets in the United States every three months, anyone placing an order for 15,000 units would be spotted. Experts reckon that as little as 0.1 micrograms of polonium-210 would be enough to kill - the equivalent of a single aspirin tablet divided into 10 million pieces."
Hank