The SI unit used for equivalent dose is:

The correct answer is the Sievert, which is the SI unit for equivalent dose in radiation protection. The equivalent dose takes into account not only the amount of radiation absorbed but also the biological effects of that radiation on human tissues. The Sievert allows for comparisons of risk across different types of radiation by incorporating factors known as radiation weighting factors, which account for the varying biological impacts of different types of radiation, such as alpha, beta, and gamma radiation.

Understanding the concept of equivalent dose is crucial in fields such as radiology and radiation safety, where it is vital to evaluate not just the physical dose (measured in Grays) but the potential biological risk associated with that dose. This distinction is important for ensuring adequate protection for individuals exposed to ionizing radiation in medical, occupational, or environmental contexts.

In contrast, the Gray is the unit of absorbed dose, directly measuring the amount of energy deposited by radiation in a material. Air Kerma is a measure of the kinetic energy released per unit mass of air and is used primarily in radiological protection and radiation therapy contexts. The Becquerel is a unit for measuring radioactivity, indicating the rate at which a sample of radioactive material disintegrates but does not account for the biological effects of