panoptic, 11 months ago I’m almost certain this is it. Most people’s experience in the early days with “glowing radioactive stuff” would have been radium paint, which glows green. Normal people wouldn’t have seen Cherenkov radiation (blue glow) Edit: just to make it clear, stuff painted with radium paint was not uncommon decades ago Source: I’m gettin kinda old
I’m almost certain this is it.
Most people’s experience in the early days with “glowing radioactive stuff” would have been radium paint, which glows green.
Normal people wouldn’t have seen Cherenkov radiation (blue glow)
Edit: just to make it clear, stuff painted with radium paint was not uncommon decades ago Source: I’m gettin kinda old