31 Radioactive Materials Safety Manual Environmental Health and Safety TABLE 1. Annual Occupational Dose Limits for Adult Workers Limit rem* Sievert (sv) Shallow Dose Equivalent, Whole-body 50 0.5 Shallow Dose Equivalent, Max. Extremity 50 0.5 Eye Dose Equivalent to the Lens of the Eye 15 0.15 Total Organ Dose Equivalent 50 0.5 Total Effective Dose Equivalent (TEDE) 5 0.05 *rem = the special unit of dose equivalent. Sievert is the S.I. dose equivalent unit. (1 rem = 0.01 sievert). Internal exposure limits are addressed through the establishment of “annual limits on intake”. The annual limits on intake is the activity of a radionuclide taken into the human body over one year that will deliver 5 rems (0.05 Sv) of committed effective dose equivalent to the body or organ committed does equivalent of 50 rems to any individual organ. Regulatory Dose Limits to Declared Pregnant Workers Federal and state regulatory agencies have adopted the National Council on Radiation Protection recommendations on radiation dose limits during pregnancy. However, the regulations only apply when a worker voluntarily declares their pregnancy. If a declaration of pregnancy is made, the worker grants consent to their employer to limit their dose to a TEDE of 500 mrem (5 mSv) throughout the entire pregnancy. If no declaration is made to the employer, their occupational dose limits remain the same. A declaration of pregnancy must be made to the RSO in writing, and can be made at any time during the pregnancy. Upon receiving the Declaration of Pregnancy form, EH&S will schedule a counseling session with the worker to review their dose history, current work, dose limits and explore methods for minimizing radiation exposure. The declaration of pregnancy can be revoked by the worker at any time and will end upon parturition. The records of dose for the embryo/ fetus will be permanently maintained by EH&S in the declared pregnant worker’s dosimetry files. Note: The first trimester is the most critical. Declare early!
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