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	Powered by Dorland's Medical Dictionary for Healthcare Consumers
	This information is provided by an independent source. Merck & Co., Inc. is not responsible for this content. Please discuss any and all treatment options with your healthcare professional. The manufacturer of a product generally has the most complete information about that product.
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	A |  B |  C |  D |  E |  F |  G |  H |  I |  J |  K |  L |  M |  N |  O |  P |  Q |  R |  S |  T |  U |  V |  W |  X |  Y |  Z   half-life (haf´līf″)   the time required for the decay of half of a sample of particles of a radionuclide or elementary particle; see also radioactivity. Symbol t1/2 or T1/2. Copyright 2007. An Elsevier publication. All rights reserved. Click here for important legal information about Dorland's Medical Dictionary.

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