What SI unit is used to measure absorbed dose?

The absorbed dose in radiation measurement is expressed in the unit called the Gray (Gy). This unit quantifies the amount of radiation energy absorbed by a material, particularly biological tissue, and is defined as the absorption of one joule of radiation energy per kilogram of matter. The Gray provides a direct way to assess the potential biological effect of radiation exposure on human beings and is essential in both medical treatment settings, such as radiation therapy, and in radiation protection.

In contrast, the other units listed relate to different aspects of radiation measurement. The Röntgen measures exposure in air, the Sievert quantifies biological effect or equivalent dose weighting different types of radiation, and the Curie relates to the radioactivity of a radioactive source. Thus, the Gray is specifically appropriate for measuring the absorbed dose, reinforcing its unique role in radiation safety and medical applications.