What is the recommended distance for personnel to stand from an active radiography source?

The recommended distance of at least 2 meters (6 feet) for personnel to stand from an active radiography source is based on principles of radiation safety, specifically the concept of distance as a means to reduce exposure. Radiation intensity decreases with distance due to the geometric spreading of the radiation beam. By maintaining a minimum distance of 2 meters or more, radiation exposure to personnel is significantly reduced, thereby enhancing their safety during radiographic operations.

This distance aligns well with safety standards established by regulatory bodies and guidelines from organizations such as the American National Standards Institute (ANSI) and the International Atomic Energy Agency (IAEA). By standing at this distance, personnel can minimize their risk of radiation exposure while still being able to perform necessary tasks associated with industrial radiography.

Maintaining such a distance is crucial in ensuring adequate protection for personnel who may be working near active sources, especially in environments where radiographs are being taken. This practice reflects a fundamental aspect of radiation protection practices, emphasizing the importance of distance in reducing exposure risk.