Which unit is commonly used to measure radiation exposure?

The Gray (Gy) is the unit that is commonly used to measure the amount of radiation energy absorbed by a material, making it particularly relevant in the context of radiation exposure. This unit focuses on the physical effects of radiation energy on matter, specifically how much energy is deposited per kilogram of tissue. In medical imaging and radiation therapy, understanding the dose in Grays helps to assess the effectiveness of treatment and the potential risk of radiation-induced effects.

While other units such as the Sievert and the Rem relate to biological effects and risk assessment linked to radiation exposure, the Gray itself is more straightforward in representing the quantity of radiation absorbed. The Röntgen is also used but primarily pertains to ionization in air and isn't as widely applicable for the measurement of absorbed dose in different contexts, especially in modern practices where the Gray is more commonly accepted.