@GoodBoy,
Yes , please confirm your sources when discussing such topics . Look at both sides of an issue rather than jumping to conclusions .
Quote from the link given by Goodboy-
"You would need about 15,000 of our Polonium-210 needle sources
at a total cost of about $1 million - to have a toxic amount."
And -
"In comparison, Amercium-241 is a similar toxic Alpha radiation emitter.
Instead of a half life of 138 days like Polonium-210 has, it has a half life of over 450 years. It is far more toxic - and there is 10 times more than the 'exempt quantity' amount in every smoke detector in your home.
If you really wanted to poison someone, you would of course have to come up with a way to remove the invisible amount of material from the exempt sources - which is just about physically impossible and combine them together. Of course you would also need that 15,000 exempt sources."
They do say this as a postscript -
"For those of you with a slightly warped sense of humor, we do sell a Polonium-210 coffee mug ."