Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. 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.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. In the International System of Units, the derived unit of radiation dose; the dose received in one hour at a distance of 1 cm from a point source of 1 mg of radium in a 0.5 mm thick platinum enclosure. Symbol: Sv

Etymologies

After Rolf Maximilian Sievert (1896-1966), Swedish radiologist.
(American Heritage® Dictionary of the English Language, Fourth Edition)
Named after the Swedish radiologist Rolf Sievert. (Wiktionary)

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