What is the purpose of a radiation survey meter?

The purpose of a radiation survey meter is to measure radiation levels in an area. This device provides a quantifiable assessment of the radiation present, which is crucial for ensuring safety in environments where radiation exposure is a concern. By measuring radiation levels, safety officers can determine whether an area is safe for personnel to enter and perform tasks, or if protective measures need to be implemented.

While the other options describe important functions related to radiation safety, they do not encapsulate the primary purpose of the meter itself. Detecting radioactive materials is typically associated with different tools specifically designed for identification, rather than measuring an area's radiation levels. Assessing contamination levels refers more to sampling processes and specialized equipment used for surface testing. Checking the integrity of lead shields involves inspections and evaluations of shielding materials and is not a direct function of a survey meter. Thus, the correct choice clearly highlights the primary and fundamental role of a radiation survey meter in monitoring environmental radiation levels.