If the x-ray tube is positioned above the table, at what distance above the table should the exposure rate be measured?

The recommended distance for measuring the exposure rate from an x-ray tube positioned above the table is typically set at 12 inches. This standardized measurement ensures that the exposure data consistently reflects the actual radiation dose that a patient would receive during a fluoroscopic procedure, as well as provides valuable information for safety assessments and regulatory compliance.

A distance of 12 inches allows practitioners to evaluate the scatter radiation in a manner that approximates typical clinical conditions, ensuring that safety practices are effectively based on realistic exposure scenarios. Accurate measurement at this distance contributes to maintaining appropriate radiation protection standards for both patients and healthcare workers by providing a reliable reference point for evaluating x-ray output and potential exposure.