Having trouble finding out if lume is radioactive
Hi I'm a learning hobbyist watchmaker and I need help. I bought this watch that has lume (the seller said it didn't), but I can't figure out if it's radium, tritium or some other stuff. It's a French yema branded watch that my Geiger counter cannot detect, but it seems like it cannot detect other tritium watches. (it detects very well radium)
The thing is that it does glow when put under uv light, and stays illuminated for a couple secs in the dark when lit with a uv light.
It does not have a mention for T on it's dial, but another yema watch that I own doesn't as well, thing is it's not from the same era (I can't put a date on the diver)
Did someone ever encounter this or would know what to do or look for?
I'm trying to know because I'm a bit scared of radioactive luminous materials.
Thanks a lot, pictures of my Geiger counter with other watches and the one I'm talking about for references.