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Just saying
The Dogfather
Catbusters
I'm here all week do try the veal etc.....
Twisted Imaginings - A Horror And Gore Themed Blog http://bit.ly/2DF1NYi
There is very little of it in a smoke detector - typically 3 micrograms. It's also an Alpha emitter so it's not going to be all that dangerous unless you ingest it as alpha particles are stopped by skin. Even if you ingest it, it's used in the form of an insoluble oxide in smoke detectors and will just pass through. In the normal way of things Alpha emitters aren't that dangerous unless you put a much more active isotope like polonium 210 into someone's tea! As long as you don't upset Putin too much you should be ok.
There is a much higher level of radiation from an old style luminous watch dial. There are probably millions of them in landfill.