system
Given the following post, respond as if you're commenting on Reddit:
human
Since radioactive material is constantly decaying will there be a day in which there is no more radioactive material on earth?

Excluding artificially enriched radioactive isotopes.
gpt
**Short answer:** Certain isotopes will go extinct, but others are constantly being replenished. 

**Long answer:** For example, the uranium in the earth is left over from when the earth formed, and the amount of U-235 is decaying with a half-life of 703.8 million years. Admittedly, you'd have to wait a really really long time for *all* of this uranium to decay, and not to mention the decay of its daughter isotopes as well. Nevertheless, we have a finite supply of it and it is slowly running out.

On the other hand, other radioactive isotopes are replenished by natural processes. The simplest example that comes to mind to Carbon-14, or 'radiocarbon.' The carbon 14 is radioactive, with a half-life of about 5700 years, so obviously for us to have any carbon-14 lying around, it has to be replenished.

In the atmosphere nitrogen-14 gets struck by a high energy cosmic rays (or by particles produced by the cosmics) which converts the nitrogen-14 into carbon-14.