Which unit is used to measure radiation dose in this context?

• A. Sievert
• B. Curie
• C. Becquerel
• D. Rem or millirem (1/1000 rem)

Answer: (D)

The main idea here is that dose in radiation safety is expressed as dose equivalent to reflect the biological impact, and in many safety contexts the unit used is the rem. The rem (and its subunit millirem) is the traditional unit for occupational exposure in the US, capturing the idea that different types of radiation can affect tissue differently. One rem equals 0.01 sievert, and a millirem is one-thousandth of a rem. In SI terms, the same concept is expressed with the sievert, where 1 sievert equals 100 rem. So this context uses rem or millirem to report dose because it aligns with common regulatory and historical practice for occupational exposure. Curie and Becquerel measure radioactivity (disintegration rates), not dose. Sievert is the SI unit for dose equivalent, but the training context here specifically references rem/millirem, which is why that option is the best choice.