There is a book by the title, Radon Girls. These were the painters of the watch faces. Most all died of cancer...
That's
Radium Girls, or at least that's the UK title.
Not quite comparable to "normal" use. These poor girls were
told to "sharpen" the point of their paintbrushes by licking them, and they painted scores if not hundreds od watches per day.
And the company not only refused to support them, but actively lied about them, including the implication that one of the girls had died of tertiary syphillis .......... when it was always bone cancer, starting - funny old thing - in the jaw.
Whatever the book is called, it's a cracking good read (author Kate Moore). But so little was known about radioactivity in them days .... the girls would also sometimes paint their teeth to give a "brilliant" smile on dates .........