A smoke alarm with an Americium source.
Inside of smoke alarm.
The sounder is on the left and the ionisation chamber on the right.
The source is 10µC of Americium 241
with a count rate of 37kBq.
Maltese cross.
Used to show electrons travel in straight lines.
The orange glow around the tube is light from the filament/cathode.
Uranium glass illuminated with UV light.
The glass fluoresces with a distinctive green colour
when illuminated with UV light.
Uranium glass is harmless - having little or no emitted radioactivity.