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The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.
Nuclear physics The length of time required for one half of a radioactive substance to be biologically eliminated from the body
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.
biological half-lifeT1/2 Biology The time required for 1⁄2 of the total amount of a particular substance in a biologic system to be degraded by biological processes when the rate of removal is nearly exponential Radiation physics The length of time required for1/2 of a radioactive substance to be biologically eliminated from the body
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.