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Radioactive decay calculator

Radioactive decay calculator allows you to calculate amount of the remaining radioactive isotope or material and percentage of the remaining isotope from the initial amount for a certain period of time as a result of radioactive decay.

Select radioactive isotope or enter half-life

Amount of substance:
Elapsed time:
Radiation is substance that carries enough energy to free electrons from atoms or molecules, thereby ionizing them.
Half-life is the amount of time required for the amount of something to fall to half its initial value. It is used to describe how quickly unstable atoms undergo radioactive decay.