What is the SI unit of equivalent dose?

The SI unit of equivalent dose is the Sievert (Sv). This unit is specifically designed to measure the biological effect of ionizing radiation, taking into account the type of radiation and its impact on human tissue. Equivalent dose is calculated by applying a quality factor to the absorbed dose, which is measured in Grays (Gy). The quality factor accounts for the different biological effects of radiation types, such as alpha particles versus beta particles or gamma rays.

Thus, the use of the Sievert allows for a better understanding of the potential risk associated with exposure to radiation, as it incorporates both the energy absorbed and the biological effect of that energy. This makes it an essential unit in the fields of radiology, radiation therapy, and radiological protection, as it provides crucial information for assessing risk to patients and workers in medical and occupational settings.