Dude its tritium. Its harmless.
https://en.m.wikipedia.org/wiki/Tritium_radioluminescence#Safety
Discussion
Okay now I have learned more about radioactive luminescense than I ever cared to know. Tritium was once used as a coating that was harmful. Now tritium is used as a gas that activates its phosphorescent tube containers. Most coated hands and dials now use Super LumiNova. There was a some transition in 1998 from Tritium to SuperLum, and that is what most manufacturers use, and I have no idea which one the Oak uses.
I agree for all practical purposes, like a watch.
the radiation it emits is minuscule and insignificant, but the history of why they stopped using it far and wide remains.
Some of the new stuff is great, but it’s not the “always glowing” stuff it used to be industry wide.