Besides from being a series of popular first-person shooter video games, half-life is an important factor to consider in any applications of radioactivity. It seems quite a weird quantity at first glance; we usually talk about the lifespan of things, rather than half a lifespan. But as you will see, the ‘half-life’ is far more logical, because the lifespan of a radioactive substance is… well, infinite (theoretically).

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