Nuclear Decay Calculator

Here, t_1/2 is the half-life of the element, which is specific to each element. By selecting an element from the table below, you are specifying the half life that appears in the table. You also must enter an initial number of moles of nuclei, and the amount of time that you would like to consider. Note that you must also select the appropriate units of time.

Element	Half-life	Element	Half-life
Uranium-238	4.4x10⁹ years	Carbon-14	5.73x10³ years
Potassium-40	1.3x10⁹ years	Phosphorus-32	14.28 days
Uranium-235	7.1x10⁸ years	Magnesium-27	9.46 minutes
Iodine-129	1.7x10⁷ years	Magnesium-20	0.6 seconds

Any scientific notation should be entered in the form (XeY) where "eY" represents multiplying by 10^Y
(e.g. 1.09*10⁵ equals 1.09e5)

Developed by

The Shodor Education Foundation, Inc.
in cooperation with the Department of Chemistry,
The University of North Carolina at Chapel Hill