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sievert

[see-vert] /ˈsi vərt/
noun, Physics.
1.
the standard unit in the International System of Units (SI) of dose equivalent having the same biological effect as one joule of x-rays per kilogram of recipient mass (or one gray):
The average person receives about 2 to 3 one-thousandths of a sievert per year from naturally occurring radiation in the environment.
Abbreviation: Sv.
Compare gray2 , rem.
Origin
named in honor of Swedish radiologist Rolf Maximilian Sievert (1896-1966)
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for sievert

sievert

/ˈsiːvət/
noun
1.
the derived SI unit of dose equivalent, equal to 1 joule per kilogram. 1 sievert is equivalent to 100 rems Sv
2.
(formerly) a unit of gamma radiation dose approximately equal to 8.4 × 10–2 gray
Word Origin
C20: named after Rolf Sievert (1896–1966), Swedish physicist
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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sievert in Medicine

sievert sie·vert (sē'vərt)
n.

Abbr. Sv A unit of ionizing radiation absorbed dose equivalent in the International System of Units, obtained as a product of the absorbed dose measure in grays and a dimensionless factor, stipulated by the International Commission on Radiological Protection, and indicating the biological effectiveness of the radiation.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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sievert in Science
sievert
  (sē'vərt)   
The SI derived 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. The sievert is named after Swedish physicist Rolf Sievert (1896-1966).
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Article for sievert

unit of radiation absorption in the International System of Units (SI). The sievert has been recommended by the International Commission on Radiation Units and Measurements (ICRU) as a substitute for the rem, the long-standing special unit for measuring biological absorption of radiation. Like the rem, the sievert takes into account the relative biologic effectiveness (RBE) of ionizing radiation, since each form of such radiation-e.g., X rays, gamma rays, neutrons-has a slightly different effect on living tissue. Accordingly, one sievert is generally defined as the amount of radiation roughly equivalent in biologic effectiveness to one gray (or 100 rads) of gamma radiation. The sievert is inconveniently large for various applications, and so the millisievert (mSv), which equals 11,000 sievert, is frequently used instead. One millisievert corresponds to 10 ergs of energy of gamma radiation transferred to one gram of living tissue.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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