What is the minimum distance for personnel for Radiation Hazard - MMR APY-11?

• A. 130 feet
• B. 15 feet
• C. 3 feet
• D. 50 feet

Answer: (A)

The distance is set to keep exposure within safe limits. Radiation hazards are evaluated by how strong the source is and how exposure falls off with distance, governed by the inverse-square principle. For the Radiation Hazard associated with the MMR APY-11, calculations and safety data show that at 130 feet the radiation level is below the permissible exposure limit for general personnel during typical operations or maintenance. If you were closer than that, the dose rate would exceed the allowed limit, so access must be restricted to stay safe. The other shorter distances would place personnel in a zone where exposure could exceed the regulatory threshold, which is why 130 feet is designated as the minimum. In practice, you’d also follow the posted hazard area, use the required administrative controls, and refer to the system’s safety documentation for any task that involves entering or working near the hazard.