Radioactive Half-Life

Choose the isotope, and the half-life will be provided for you.
(Or manually enter the half-life of an isotope not on the list.)
Then enter the original amount and elapsed time to calculate
the amount of isotope remaining.

Select the isotope: 
Half-life (in days):   
Enter the amount of starting material (in μCi):     
Enter the time elapsed (in days):     


 μCi   or    %.