the basic unit in the SI system that is used to measure the amount of biological damage caused by various types of ionizing radiation, equal to the dose that produces the same amount of damage in human tissue as one gray of X-rays (100 rem or 8.38 roentgens): abbrev. Sv
See sievert in American Heritage Dictionary 4
noun Abbr. Sv
The SI unit for the amount of ionizing radiation required to produce the same biological effect as one rad of high-penetration x-rays, equivalent to a gray for x-rays.
Origin: After Rolf Maximilian Sievert (1896-1966), Swedish radiologist