Half-life period (T_1/2 or t_1/2): The half-life period of the radioelement is described, as the time required by the given amount of the element to decay to one-half of the initial value.

Now as λ is a constant, we can conclude that the half-life period of a particular radioelement is independent of amount of the radioelement. Or in other words, we can say that whatever might be the amount of the radioactive element present at the time, it will always decompose to its half at end of one half-life period.

Let initial amount of the radioactive substance be N_o

The total amount of the radioactive substance left after the n half-life periods

Total time T = n * t_1/2  where n is the whole number.

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