How?
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Radiation damages your DNA, the instructions that your cells have to do what they do.
Most frequently, that damage ruins the instructions so that cell cannot live any more and it dies and you’re fine, because it’s one cell.
In rare occasions that damage can ruin just enough instructions that the cell can still live, but it’s forgotten how to do anything other than reproduce into more damaged cells. Those damaged cells grow and reproduce into more damaged cells. On and on and before long what used to be your liver is now just a blob of useless cells. That’s bad because now you don’t have a liver any more.
That’s pretty much the gist.
Radiation can be used to kill cancer cells because it can be used to kill *any cell*s*.* It’s also handy because you can use advanced technology to target the “kill zone” of the radiation to the tumor or cells you want without having to cut open the body or expose *other healthy cells* to the radiation. Obviously it’s not perfect, it’s just the weapon we have at the current time.
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