When should a rescuer leave the area for decontamination when using a monitor dosimeter?

The correct answer is based on established safety protocols for radiation exposure during rescue operations. When using a monitor dosimeter, a rescuer should leave the area for decontamination when the dose approaches 25 R. This threshold is significant as it represents a level of radiation exposure that is deemed risky for ongoing work in a contaminated environment.

Staying within exposure limits is critical to ensure the health and safety of the rescuers. The 25 R mark is a precautionary limit that allows sufficient time for decontamination procedures while minimizing long-term health risks associated with radiation exposure. By adhering to this guideline, rescuers can effectively manage their exposure and mitigate the potential for acute radiation syndrome or other radiation-related health issues.

In contrast, higher thresholds such as 50 R or 75 R would represent levels that increase the risk of radiation-related health effects, leading to a potentially serious consequence for rescuer safety if they were to remain in the contaminated area. Leaving at the 25 R threshold ensures that immediate safety measures are taken without exceeding acceptable exposure limits.