Alexander Litvinenko was killed with a small dose of radioactive Polonium-210. With a half-life of only 138 days, PO-210 is not the sort of radioactive isotope that can be mined and refined. It takes an advanced nuclear program to create.
Or, if you’re in the United States, just visit United Nuclear and order some by return mail–starting at only $69.
Oh, and if you think that’s dangerous, look at the other dangerous materials United Nuclear sells: magnets.
Beware – you must think ahead when moving these magnets.
If carrying one into another room, carefully plan the route you will be taking. Computers & monitors will be affected in an entire room. Loose metallic objects and other magnets may become airborne and fly considerable distances – and at great speed – to attach themselves to this magnet. If you get caught in between the two, you can get injured.Two of these magnets close together can create an almost unbelievable magnetic field that can be very dangerous. Of all the unique items we offer for sale, we consider these items the most dangerous of all. Our normal packing & shipping personnel refuse to package these magnets – our engineers have to do it. This is no joke and we cannot stress it strongly enough – that you must be extremely careful – and know what you’re doing with these magnets.
Take Note: Two Super magnets can very easily get out of control and break fingers and even your arm if opposing poles fly at each other. If working with multiple Supermagnets, always handle one magnet at a time, secure it, then proceed to the next magnet. (Source.)
I want one … make that two. ;-)