Just because it's 'just' an alpha emitter doesn't mean it's easy to get. It may be more or less harmless when outside of your body, but everybody knows what will happen when someone ingests it. It's potentially very hazardous. Unless it came straight out of a lab in Russia (;) ) I see no way it could have come from a normal European lab (with it's minimal security, when radioactive stuff is involved, even when just alpha emitters. we've definately learned things since the 70-80s.)

As for other things like chloroform, yes that's probably relatively easy,

Cheers