Radiation Safety Manual

6.  Radiation Exposure Limits

The following limits are established with the understanding that radiation exposures, except as required by medical necessity, are undesirable. The UCAR Radiation Safety Program is designed to reduce all radiation exposures, above background level, to a level "As Low As Reasonably Achievable" (ALARA). The limits established below are only general guides to upper limits that should be reached only infrequently, if ever.

6.1  External Radiation Exposure Limits

Per applicable regulations:

Total Effective Dose, Whole Body: 5 rem/year

Individual Organs, Deep Dose Equivalent: 50 rem/year

Eye Dose Equivalent: 15 rem/year

Skin or extremity: 50 rem/year

Embryo/fetus: 0.5 rem/year

Public, Total Effective Dose: 0.1 rem/year or 0.002 rem/hour

6.2  Internal Radiation Exposure Limits

No individual may be exposed to concentrations of radioactive contaminants in air or water in excess of limits specified by the Nuclear Regulatory Commission. Contact the RSO for these values, which are too voluminous for inclusion.

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