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decay constant

noun, Physics.
the reciprocal of the decay time.
Also called decay rate, disintegration constant.
Origin of decay constant
1930-35 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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decay-constant in Medicine

decay constant n.

Symbol λ 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. Also called disintegration constant, radioactive constant.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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