What is the required measurement range for radiation survey instruments?

The correct measurement range for radiation survey instruments is 2 mR/hr to 1 R/hr because this range allows for sufficient sensitivity to detect lower levels of radiation while also accommodating higher radiation levels typically encountered in contexts such as medical facilities, nuclear power plants, and laboratories.

Survey instruments need to be versatile to ensure they can effectively monitor radiation exposure in various situations. A range starting from 2 mR/hr is sufficiently low to detect minimum levels of radiation, which is crucial for ensuring safety and regulatory compliance. The upper limit of 1 R/hr provides a threshold that is high enough for emergency response scenarios or work environments where radiation levels can become elevated.

This range addresses the operational needs of professionals working in radiation safety, ensuring that they can detect both low and high radiation levels without the instrument being saturated or unable to register lower amounts.