Which dosimeter provides real-time dose rate and alarms, enabling immediate protective actions?

• A. TLDs
• B. Electronic Personal Dosimeters
• C. OSLDs
• D. Film badges

Answer: (B)

The main idea here is real-time monitoring. An electronic personal dosimeter is designed to continuously measure the dose rate as you work and display the current rate, accumulated dose, and often provide audible or visual alarms when the rate or dose exceeds set limits. This lets you take immediate protective actions—like stepping back, reducing time in the area, or increasing shielding—before too much dose accumulates.

Other dosimeters like thermoluminescent dosimeters (TLDs), optically stimulated luminescence dosimeters (OSLDs), and film badges are passive devices. They record the total dose over a period and require a reader or processing after exposure to determine what happened. They don’t provide instantaneous feedback, so they can’t trigger real-time protective actions.

So the device that enables immediate protective actions by showing real-time dose rate and sounding alarms is the electronic personal dosimeter.