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Dose: A general term used to refer to the effect on a material that is exposed to radiation. 1  Gray (Gy): The international system (SI) unit of radiation dose expressed in terms of absorbed energy per unit mass of tissue. 2  Sievert (Sv): A sievert is the standard international measurement of dose. 3  rad (R): The original unit developed for expressing ...
Absorbed dose is a measure of the energy deposited in a medium by ionizing radiation.It is equal to the energy deposited per unit mass of medium, and so has the unit J/kg or gray (Gy) where 1Gy = 1Jkg -1. The absorbed dose is not a good indicator of the likely biological effect.1 Gy of alpha radiation would be much more biologically damaging than 1 Gy of photon radiation for example.Appropriate weighting factors can be applied reflecting the different relative biological effects to find the equivalent dose.bsorbed dose is a measure of the energy deposited in a medium by ionizing radiation.