why is there still radioactive material on earth? Why hasn’t it all decayed?
In: 16
In addition to their long half-lives and the chains of decay, there’s also the fact that some radioisotopes still get created through natural processes. For example carbon-14 gets made in the upper atmosphere when stray stable carbon atoms get blasted with cosmic rays. But I assume you mean minerals like uranium-235, so the other answers given here are more relevant.
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