Plutonium is highly carcinogenic in small quantities and its release into the environment would be consideredvery dangerous.
Yeah, even worse is the microcurie of Americium 241 (a plutonium byproduct) in your smoke detector.
Don't eat it. But as an alpha emitter, you're completely shielded by inches of air or a sheet of paper or your skin. Unless its dispersed in air and you breathe it, or you eat a compound of it.
