decay constant

noun Physics.

the reciprocal of the decay time.

Origin of decay constant

First recorded in 1930–35
Also called decay rate, disintegration constant. Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Medicine definitions for decay constant

decay constant


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

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