<Li> The gray (Gy), which has units of (joules / kilogram), is the SI unit of absorbed dose, and it is the amount of radiation required to deposit one joule of energy in one kilogram of any kind of matter . </Li> <Li> The rad is the (obsolete) corresponding traditional unit, equal to 10 millijoules of energy deposited per kilogram. 100 rad = 1 gray . </Li> <P> The equivalent dose is the measure of the biological effect of radiation on human tissue . For X-rays it is equal to the absorbed dose . </P> <Ul> <Li> The Roentgen equivalent man (rem) is the traditional unit of equivalent dose . For X-rays it is equal to the rad, or, in other words, 10 millijoules of energy deposited per kilogram. 100 rem = 1 Sv . </Li> <Li> The sievert (Sv) is the SI unit of equivalent dose, and also of effective dose . For X-rays the "equivalent dose" is numerically equal to a Gray (Gy). 1 Sv = 1 Gy . For the "effective dose" of X-rays, it is usually not equal to the Gray (Gy). </Li> </Ul>

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