The term 'ABSORBED Radiation UNIT' is composed of three words: RAD, which stands for 'Radiation ABSORBED Dose'; ABSORBED, which means to take in or soak up; and UNIT, which is a measure of a quantity. This term is used to describe the amount of radiation ABSORBED by a material or organism. It is typically measured in units of gray (Gy) or sievert (Sv). The UNIT is used to measure the amount of radiation that has been ABSORBED by a person or object, and is an important factor in determining the risk of radiation-related health effects.