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Use JavaScript to find how much radioactive material remains after a given time.

Note: Please enter the halflife, original amount, and elapsed time since the original amount was true and the current amount, and percentof 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.

 
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