Bioassay program relating to occupational medicine questions?

[Irradiated1]

I have worked in Radiation Safety at 2 different universities over the past 15 years. Both Universities have bioassay monitoring programs for Tritium and Radioiodine yet neither place had an occupational medicine program to be evaluated by a physician.

Can anyone point me to guidance documents or regs on bioassay monitoring programs. To include threshold limits for stop work and advisement on seeking advise from a board certified physician in occupational medicine.

Thanks