What is the unit commonly used for activity besides the curie?

What is the unit commonly used for activity besides the curie?

• A. Curie
• B. Sievert
• C. Gray
• D. Becquerel

Answer: (D)

Activity is the rate at which radioactive decays occur. The SI unit for this rate is the Becquerel, defined as one disintegration per second. This is the standard unit used for activity alongside the older curie, which equals 3.7×10^10 decays per second. The other two options measure dose, not activity: the Gray is absorbed dose, and the Sievert is dose in terms of biological effect. Therefore, Becquerel is the unit commonly used for activity besides the curie.

Activity is the rate at which radioactive decays occur. The SI unit for this rate is the Becquerel, defined as one disintegration per second. This is the standard unit used for activity alongside the older curie, which equals 3.7×10^10 decays per second. The other two options measure dose, not activity: the Gray is absorbed dose, and the Sievert is dose in terms of biological effect. Therefore, Becquerel is the unit commonly used for activity besides the curie.