A very rare element in nature, polonium is found in uranium ores at about 100 micrograms per metric ton (1:1010). Its natural abundance is approximately 0.2% of the abundance of radium. Polonium has been found in tobacco smoke from tobacco leaves grown with phosphate fertilizers.

Synthesis by (n,g) reaction

In 1934 an experiment showed that when natural [Bismuth 209] is bombarded with neutrons, [Bismuth 210], which is the parent of polonium, was created. Polonium may now be made in milligram amounts in this procedure which uses high neutron fluxes found in nuclear reactors. Only about 100 grams is believed to be produced each year, making polonium exceedingly rare.

Wow, that's a cowardly piece of writing. He rhetorically asks the cui bono question over and over again, to the point where it becomes tedious. The effect is deliberate because he clearly only has one answer in mind, but he's too afraid to say the words: Jews, Zionists, Neocons. This sort of game — common in certain paleo quarters — of "raising questions" without offering the answers they clearly have in mind is an attempt to seem brave without actually risking anything.

Oh, and Buchanan's conspiracy idea rests on the assumption that until this moment Putin has been some kind of Jeffersonian democrat, which is a bit hard to square with the public record. Why would Buchanan distort reality that way? Why? What does he have to benefit? What could motivate him? What demons does he have? Cui bono?