Stories We Like: A Guide to the Comma

1.

the reciprocal of the decay time.

Also called decay rate, disintegration constant.

Origin

1930-1935

Dictionary.com Unabridged

Based on the Random House Dictionary, © Random House, Inc. 2014.

Cite This Source

Based on the Random House Dictionary, © Random House, Inc. 2014.

Cite This Source

Examples for decay constant

- The decay and ingrowth corrections must be in time units consistent with the
*decay constant*. - Activity is defined as being equal to n x l, where n is the number of atoms of a radionuclide and l is the
*decay constant*.

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.

Cite This Source

Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Cite This Source

Encyclopedia Article for decay constant

proportionality between the size of a population of radioactive atoms and the rate at which the population decreases because of radioactive decay. Suppose N is the size of a population of radioactive atoms at a given time t, and dN is the amount by which the population decreases in time dt; then the rate of change is given by the equation dN/dt=lambdaN, where lambda is the decay constant. Integration of this equation yields N=N0elambdat, where N0 is the size of an initial population of radioactive atoms at time t=0. This shows that the population decays exponentially at a rate that depends on the decay constant. The time required for half of the original population of radioactive atoms to decay is called the half-life. The relationship between the half-life, T1/2, and the decay constant is given by T1/2=0.693/lambda.

Learn more about decay constant with a free trial on Britannica.com

Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.

Cite This Source

Cite This Source

11

11

Scrabble
Words With Friends