Radiation safety rule in which the operator stands 6 feet from the source of x-rays and is positioned between 90° to 135° to the primary beam to minimize occupational exposure is known as which rule?

• A. Distance and position rule
• B. Time and distance rule
• C. Shielding rule
• D. Inverse square rule

Answer: (A)

The main idea tested is how to minimize occupational exposure by combining distance and proper positioning relative to the x-ray beam. The rule says stand about 6 feet away from the source and be positioned between 90° and 135° to the primary beam. Increasing distance reduces dose because radiation intensity drops with distance, following the inverse relationship between separation and exposure. Positioning at 90° to 135° places you out of the direct path of the primary beam, reducing your exposure to scatter and leakage that occur around the patient and beamline.

This description fits a rule that explicitly uses both how far you are and where you stand in relation to the beam. Other options focus on time, shielding barriers, or a general physics principle, but they don’t specify the combined distance-and-angle stance that minimizes occupational exposure in this practical way.