sievert(redirected from Megasievert)
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n. 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.
[After Rolf Maximilian Sievert (1896-1966), Swedish radiologist.]
1. (Units) the derived SI unit of dose equivalent, equal to 1 joule per kilogram. 1 sievert is equivalent to 100 rems. Symbol: Sv
2. (Units) (formerly) a unit of gamma radiation dose approximately equal to 8.4 × 10–2 gray
[C20: named after Rolf Sievert (1896–1966), Swedish physicist]
A unit used to measure the amount of radiation necessary to produce the same effect on living tissue as one gray of high-penetration x-rays.