What is the standard unit of measurement for the activity of a radionuclide in these regulations, expressed as Bq?

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Multiple Choice

What is the standard unit of measurement for the activity of a radionuclide in these regulations, expressed as Bq?

Explanation:
Activity is the rate at which a radionuclide decays, i.e., how many disintegrations occur per unit time. The unit for this rate in the SI system is the becquerel, defined as one disintegration per second. That’s exactly what Bq represents, so it’s the standard unit used in regulations to express activity. You might also see larger multiples like kBq or MBq for practical amounts. The other two units measure dose, not activity: the gray measures absorbed energy per mass, and the sievert accounts for biological effect. The curie is an older non-SI unit equivalent to 3.7×10^10 disintegrations per second, which is why it’s not the standard today.

Activity is the rate at which a radionuclide decays, i.e., how many disintegrations occur per unit time. The unit for this rate in the SI system is the becquerel, defined as one disintegration per second. That’s exactly what Bq represents, so it’s the standard unit used in regulations to express activity. You might also see larger multiples like kBq or MBq for practical amounts. The other two units measure dose, not activity: the gray measures absorbed energy per mass, and the sievert accounts for biological effect. The curie is an older non-SI unit equivalent to 3.7×10^10 disintegrations per second, which is why it’s not the standard today.

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