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decay constant

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noun Physics.
  1. the reciprocal of the decay time.
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Origin of decay constant

First recorded in 1930–35
Also called decay rate, disintegration constant.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

decay constant in Medicine

decay constant

n.
  1. The constant ratio for the number of atoms of a radionuclide that decay in a given period of time compared with the total number of atoms of the same kind present at the beginning of that period.disintegration constant radioactive constant
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.