This page will calculate the amount of radioactive material left after a given length of time. Please enter the
halflife, original amount, and elapsed time since the original amount was true and the current amount, and percent
of the original will be returned. Please note that the time periods and mass amounts must be in the same units or
the results will be inaccurate.
Halflife
Amount
Time
The amount remaining is: or percent of the original sample.
This page is written by Jonathan Tomshine, circa 1995.