[cynwoody]

Where are the alpha particles?

Polonium isn't available to your average terrorist. TLAs, yes. E.g., one TLA trying to frame another TLA?

[Rebelbase]

“I’m sure that in 1985, polonium is available at every corner drug store, but in 1955, it’s a little hard to come by.”

[greeneyes]

Isn’t that what the Russians used?

[TexasGator]

Polonium is an industrial comodity.