Which of the following describes an SRD accurately?

The correct choice accurately describes an SRD, or Self-Reading Dosimeter. An SRD provides a real-time estimate of the occupational dose of radiation that a worker is exposed to. This capability is crucial for ensuring that workers can monitor their exposure levels throughout their shift, allowing them to take immediate action if they are approaching threshold limits.

By continuously displaying the accumulated dose, the SRD assists workers in staying informed about their radiation exposure and encourages safe practices in environments where radiation is present.

Other options may incorrectly characterize the SRD or its functionalities. For instance, while an SRD is important for tracking dose exposure, it does not provide a legal dose record with alarm features as a primary function; that's typically associated with more sophisticated dosimetry systems. Moreover, the notion that it is worn by every worker at all times oversimplifies its application, as there are specific situations or roles within radiation work where an SRD may not be mandatory. Lastly, the information regarding the capability of measuring gamma radiation is misleading; an SRD is designed to measure various types of radiation, including gamma rays, depending on the technology used in its construction.