What is the unit used to measure radiation?

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Study for the Ontario Power Generation (OPG) Orange 1 Test. Ace your exam with multiple choice questions and detailed explanations. Prepare confidently!

Multiple Choice

What is the unit used to measure radiation?

Explanation:
The idea here is dose equivalent—the measure that reflects the radiation’s effect on a person. Historically, this is expressed in rem (roentgen equivalent man) or its subunit milliRem. That’s why rem or mrem is the best fit for “the unit used to measure radiation” in this context. Key relationships to keep in mind: 1 rem equals 1000 mrem, and in SI terms, 1 sievert (Sv) equals 100 rem (so 1 mSv equals 100 mrem). Gy is the absorbed dose (energy per mass, not adjusted for biological effect), while Ci is a unit of radioactivity (how much radioactive material is present). Sv is also a unit for dose equivalent, but rem/mrem is the traditional unit referenced in many practical safety contexts.

The idea here is dose equivalent—the measure that reflects the radiation’s effect on a person. Historically, this is expressed in rem (roentgen equivalent man) or its subunit milliRem. That’s why rem or mrem is the best fit for “the unit used to measure radiation” in this context.

Key relationships to keep in mind: 1 rem equals 1000 mrem, and in SI terms, 1 sievert (Sv) equals 100 rem (so 1 mSv equals 100 mrem). Gy is the absorbed dose (energy per mass, not adjusted for biological effect), while Ci is a unit of radioactivity (how much radioactive material is present). Sv is also a unit for dose equivalent, but rem/mrem is the traditional unit referenced in many practical safety contexts.

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