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This is Klaus and he asks himself, what does the term "half-life" actually mean?
Let's imagine Klaus buys a flock of sheep.
All of the sheep are very jittery. But after one day half the flock calm down.
But be carefull! That doesn't mean that by the next day the whole flock has calmed down.
Because after the half-life period of another day, again only half of the remaining angry flock will behave as they should.
This continues and so on and so forth. Until at some point the entire flock has calmed down.
Hence, in this case, the half-life of the naughty black sheep within the flock would be ONE DAY.
If half of the sheep became well and properly behaved not in one day, but even in one hour,
...the half-life of the black sheep would be exactly an hour. Thus the flock would also calm down much more quickly.
The same also applies to radioactive materials. Radionuclides have a half-life, too, during which half of the material decays.
In the process, other radionuclides form, which in turn decay as well.
Here, too, the period in which exactly half of the material decays is also called "half-life".
There are materials with very short half-lives. So these decay very quickly, in a few milliseconds.
Other radioactive materials have half-lives of several million years or even much longer.
Anyway, Klaus's sheep have all calmed down, and now he's looking forward to enjoying some nice sheep's cheese.