Which quantity is displayed by a device that measures the equivalent dose rate?

• A. Sv/hr
• B. Seconds
• C. C/kg
• D. Gy

Answer: (A)

Equivalent dose rate measures how quickly radiation produces biological effects, taking into account the radiation type. That means the readout is in units of Sieverts per unit time, not just time or a raw energy deposit. A device that measures this would display Sv/h (often you might see mSv/h in practice).

Seconds would be just a time interval, not a dose-related quantity. C/kg represents exposure in air, not the biological- effect-weighted dose rate. Gy is absorbed dose (energy per mass) and doesn’t include the radiation quality factor, so it isn’t the equivalent dose rate.