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Chemistry Fundamentals Program 
Nuclear Decay Calculator
Use this calculator to investigate how a unstable substance decays over
time. The first two equations are found in the Nuclear Chemistry section.
From the above two equations, we derive the following, which we use as the mathematical basis
for calculating decay.
Here, t_{1/2} is the halflife 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 
Halflife 

Element 
Halflife 
Uranium238 
4.4x10^{9} years 
Carbon14 
5.73x10^{3} years 
Potassium40 
1.3x10^{9} years 
Phosphorus32 
14.28 days 
Uranium235 
7.1x10^{8} years 
Magnesium27 
9.46 minutes 
Iodine129 
1.7x10^{7} years 
Magnesium20 
0.6 seconds 
Any scientific notation should be entered in the form (XeY) where "eY" represents multiplying by 10^{Y}
(e.g. 1.09*10^{5} equals 1.09e5)
