What device measures the amount of radiation a person is exposed to?

• A. Detector
• B. Dosimeter
• C. Geiger counter
• D. Survey meter

Answer: (B)

A dosimeter measures the amount of radiation a person is exposed to. It’s designed to be worn by an individual and records cumulative exposure over time, often giving dose or dose-equivalent values in units like sieverts or rems. Detectors and Geiger counters focus on detecting radiation events or rate, not the total dose a person accumulates. A survey meter assesses ambient radiation levels in the environment, not the personal dose received. Different dosimeter types exist, including film badges, thermoluminescent dosimeters (TLDs), optically stimulated luminescent dosimeters (OSLs), and electronic personal dosimeters, all used to monitor occupational exposure and ensure regulatory limits are not exceeded.