I was pondering this topic again this morning.  Here is another Radiation dose chart that looks like similar data as above but formatted differently.  I am also posting a document produced by the NRC.  A screen capture of the most interesting page that relates to watches and watchmakers is also posted here. My Dad worked on watches six days a week, 51 weeks a year from 1947 to 1980 (he continued working after 1980 but only a few days per week).  There was radium lume for re-luming hands and