Radiation Safety Practice Exam

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What does 'µCi' stand for?

  1. Millicurie

  2. Microcurie

  3. Nanocurie

  4. Centicurie

The correct answer is: Microcurie

'µCi' stands for microcurie, which is a unit of radioactivity. The prefix 'µ' (micro) indicates one-millionth (10^-6) of a curie. The curie, a standard unit of measurement for radioactivity, was originally based on the activity of radium-226. To put microcuries in perspective, one microcurie corresponds to approximately 37,000 disintegrations per second. This unit is commonly used in radiation safety and health physics to measure very small quantities of radioactive materials, as many applications involve low levels of radiation where smaller units provide a more practical scale of measurement.

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