What is the allowed background radiation level for the darkroom?

The allowed background radiation level for a darkroom is typically set to ensure that any exposure to radiation remains well within safety limits for both workers and patients. In this context, a background radiation level of 7 mR/hr is a relevant standard that aligns with safety guidelines designed to minimize radiation exposure.

This level is considered to be acceptable as it provides a threshold that allows for adequate functionality of the darkroom while maintaining safety. Maintaining the darkroom at this level ensures that radiation from external sources does not interfere with the quality of imaging or the safety of personnel working in the environment.

In contrast, lower values such as 0.7 mR/hr or 0.07 mR/hr, while technically safe, might be impractical or unnecessarily conservative for typical darkroom operations, and the level at 7 mR/min far exceeds standard safety thresholds. The chosen value strikes a balance between operational practicality and health safety regulations.