system
Given the following post, respond as if you're commenting on Reddit:
human
eli5 How come if highly radioactive radium was on watches that the wearers didn’t succumb to radiation poisoning at the wrist?
gpt
Even a cheap wristwatch has the clock face encased in metal and glass, which would have provided at least some sheilding. Compare and contrast with the Radium Girls, who had a more direct, prolonged exposure to the radium paint.