3.1 Maximum Permissible Dose Limits

3.1.1 Radiation Workers

Maximum permissible dose limits for adult radiation workers (listed below) apply to any combination of dose received from external or internal exposure.  These limits do not apply to doses received from background radiation or from medical procedures.  An adult radiation worker is defined as an individual 18 years of age or older.  Iowa child labor laws prohibit individuals under the age of 18 from working with certain types of radioactive materials or in certain areas where occupational radiation exposure may occur.  It is the policy of EHS that minors are not normally permitted to work with sources of ionizing radiation at The University of Iowa.  For more information regarding this policy, contact the Radiation Safety Officer at 335-8501.

3.1.2 Declared Pregnant Radiation Worker

Under state and federal law, the dose limit of a pregnant radiation worker remains at 5,000 mrem per year until she specifically declares her pregnancy in a written and signed statement directed to EHS.  The declaration is voluntary.  Following EHS’s receipt of a signed Declaration of Pregnancy form, the dose limit to the worker’s embryo/fetus is limited to 500 mrem for the duration of her pregnancy.

Upon the receipt of a signed Declaration of Pregnancy form, EHS will monitor potential internal and/or external exposure to the embryo/fetus as appropriate.  

EHS recommends that a pregnant radiation worker declare her pregnancy so that her occupational radiation exposure potential can be evaluated to ensure that the dose to the unborn child does not exceed 500 mrem over the duration of the pregnancy.

3.1.3 General Public

The limit to members of the general public (including employees not involved in working with sources of ionizing radiation) is 100 mrem per year resulting from licensed or registered activities at this institution.