What is the unit of measurement for absorbed dose in radiation?

The unit of measurement for absorbed dose in radiation is the Gray. The Gray is defined as the absorption of one joule of radiation energy by one kilogram of matter. This measurement is crucial in fields such as radiology and radiation therapy to evaluate the amount of energy deposited in tissues, which can influence treatment planning and radiation protection measures.

The Rad, while historically used, has largely been replaced by the Gray in modern practice. One Gray is equivalent to 100 rads, which illustrates the shift towards the SI unit of measure. The Sievert is a unit that measures the biological effect of ionizing radiation, taking into account not just the amount of energy absorbed but also the type of radiation and its biological impact. The Roentgen is a unit of measurement for exposure to ionizing radiation in air, but it does not directly relate to the energy absorbed by tissues.

The Gray is now the standard in defining absorbed doses in radiation safety and medical imaging contexts, underscoring its importance in understanding and managing exposure to radiation.