Yeah I noticed that (Of course they could care less now at those low
values). I have a friend who has an oooold smoke detector that uses
Polonium or some such for co2 detection.
Cool, polonium is also used in anti-static brushes. These days, ionization style smoke detectors use americium. I'm looking for an ooooold americium one for my element collection, as americium has a shortish half-life, and a really old unit would be mostly neptunium by now.
- John
