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The half-life is a fixed period of time: the average time it will take for one of every two atoms to decay to another isotope or element.

So no matter how much of a given radioactive isotope that you start with, only one-half of it will still be that isotope after a single half-life period. Likewise only half of that remaining material will be the same isotope after another half-life period.

Of course, some of the atoms will be decaying all the time, so the half-life is only a convenient way to define the quantity at any given time.

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