What is a Self-Reading Dosimeter (SRD)?

• A. A device that measures ambient environmental radiation only.
• B. A device that continuously records dose over a lifetime.
• C. A device that allows workers to routinely check their dose while working.
• D. A device that calibrates other dosimeters.

Answer: (C)

Self-reading dosimeters are worn by the worker and are designed to display the wearer’s own radiation dose directly. The main idea is that the person can check their dose while they’re on the job, giving immediate feedback and allowing quick actions if exposure is rising. This supports real-time awareness and safer work practices, aligning with ALARA principles.

The device isn’t just measuring the environment around the worker; it provides a personal readout of the dose the individual has accumulated, so it’s different from ambient meters that reflect only the surroundings. It’s also not primarily about continuously recording a lifetime total—it’s about giving the worker a routine, on-the-spot readout during the shift, though the data can be stored for later review by the dosimetry service. It isn’t intended as a tool for calibrating other dosimeters.