Should I use a Geiger counter to identify uranium glass?
It is not recommended to use a Geiger counter to identify uranium glass for several reasons -
Uranium is primarily an alpha particle emitter, and household Geiger counters do not measure alpha radiation
Lots and lots of uranium glass does not have enough radioactivity to measure above background radiation levels
Many uranium glass pieces in jewelry are too small to be measured
Now with that said, uranium glass does emit beta radiation, so a Geiger can be a useful tool when trying to determine if something is uranium glass if the glow is unusual. To be considered a positive identification for uranium glass, it must read 50cpm or above on a Geiger, which is considered above normal background radiation. If you test a piece and don't get a reading, that still does not mean the piece isn't uranium glass. For the above list of reasons, a Geiger counter can positively identify a piece of uranium glass, but it cannot negatively identify it.
Normal radiation reading on an enormous antique uranium glass Bohemian bridal bowl
This piece glows bright green so it is still uranium glass