Occupational limits for radionuclide exposure address ingestion, inhalation, and external exposure and are set by the Nuclear Regulatory Commission (NRC) for NRC licensees and by the Department of Energy for DOE facilities. "The NRC limits for I-131" are as follows:
- 2 ×10-8 µCi/mL (for occupational air exposure)
- 2 ×10-10 µCi/mL (for effluent air to which the public could be exposed)
- 1 ×10-6 µCi/mL (in effluent water), and
- 1 ×10-5 µCi/mL (for monthly average releases to sewers from medical facilities).
These NRC limits are intended to ensure that no worker exceeds 50 mSv (5 rem) of I-131 to the whole body or 500 mSv (50 rem) to the thyroid, and that no member of the public exceeds 1 mSv (0.1 rem) to the whole body.
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