What is one primary reason for using radiation detection devices?

Monitoring radiation levels for safety purposes is crucial in a variety of settings, particularly in environments where radiation sources are present, such as hospitals, nuclear power plants, and research facilities. The primary reason for using radiation detection devices lies in their ability to identify and quantify ionizing radiation, ensuring that exposure levels remain within safe limits for both workers and the general public. This monitoring helps to mitigate health risks associated with radioactive exposure, enabling prompt action when radiation levels exceed regulatory standards or expected thresholds.

While the other options may involve important processes, they do not align with the core function of radiation detection devices. For instance, measuring temperature variations relates more to thermal sensors, detecting chemical compositions pertains to analytical chemistry tools, and enhancing visual inspections focuses on different technologies like cameras or imaging devices. Thus, ensuring safety through radiation monitoring stands out as the primary and vital use of radiation detection devices.