Back in the 60's one of my duties was to be part of a six man "Special Safety Team"., that would get shipped out if there was a crash involving a Nuclear Weapon. We would regularly practice doing "sweeps" with a Geiger Counter & a radioactive isotope, which would be hidden in long grass. On one practice sessions, while waiting for the isotope to be hidden, I took off the Omega aircrew watch that I was issued with & was amazed to find that it was radiating more than ten times the practice isotope !!
I have worn the watch on & off for the past 50 years. I glow in the dark a bit, but no other problems.