Definition of "sievert" []

• 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. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "To estimate this, dose equivalent, in a unit called the sievert (Sv), is used."
• "To distinguish between different levels of danger in similar quantities of radiation, scientists use a measure called a sievert."
• "Comparitively speaking, a becquerel is very little radiation, while a gray and a sievert are a lot, physicists say."