> David typed up a list of sources for fourteen radioactive isotopes..Americium-241, he learned from the Boy Scout atomic-energy booklet, could be found in smoke detectors
Yes and also several ores often found at rock shops, some Fiestaware, uranium glass, add if course radium dial watches. All legal in the US in small quantities and harmless as long as you don't ingest or inhale their dust.
I usually hear them referred to as smoke detectors (U.S.). Some decades ago when I checked mine had a small metal enclosure with a pin-head amount of Americium inside.
Pretty sure though that if you live at very high elevations like Denver, Colorado, you'll get vapor trails for free. :-)
