Which safety device is essential for monitoring radiation levels in a controlled area?

A radiation survey meter is essential for monitoring radiation levels because it provides a direct measurement of the radiation present in a controlled area. This device allows personnel to assess the radiation exposure risk effectively and continuously. By using a radiation survey meter, safety personnel can ensure that the radiation levels remain within acceptable limits, facilitating a safe working environment for all individuals involved in industrial radiography activities. It is an indispensable tool for detecting and measuring ionizing radiation, helping to identify areas that may require additional protection measures such as shielding or restricted access.

In contrast, while radiation shielding and personal protective equipment contribute to overall safety, their primary function is to protect individuals rather than measure radiation levels. Emergency response kits are designed for addressing incidents and mitigating the consequences of radiation exposure, but they do not provide ongoing monitoring of exposure levels.