- Half life is the time taken for radioisotope to decay to half of its original quantity.
- Different radioisotope have different value of half life.

The half life formula is an exponential equation:

where N

_{t}is the remaining substance after time`t`,`N`is the initial amount of the substance, t_{0}_{1/2}is the half life of the substance, and`t`is the elapsed time.

**Click on the diagram below to play!**

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