What restriction applies after radiopharmaceutical treatment?

• A. Cannot enter zoned or unzoned areas or participate in the dosimetry program
• B. Enter all zones freely
• C. Enter Zone 1 only
• D. None of the above

Answer: (A)

After radiopharmaceutical treatment, the person becomes a source of radiation and must be protected from exposing others as the activity decays. To keep staff and the public safe, access to radiological areas is restricted and the treated individual is not included in the dosimetry monitoring program during the period of elevated emission. This means they should not enter zoned (controlled) areas or unzoned areas, and they should not participate in the dosimetry program until their radiation level has fallen to or below the facility’s defined limits.

This comprehensive restriction minimizes the chance of incidental exposure and simplifies dose accounting for others in the workplace. As the radiopharmaceutical decays, the restrictions are typically eased according to established safety guidelines. Entering any area or being part of dosimetry during the active period would increase exposure risk, so the all-encompassing restriction is the correct stance.