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Unlike self-regeneration, which is a continuous process in which degraded isotopes continuously get replaced, supernovas deposit isotopes intermittently and comparatively infrequently.In fact, if a supernova deposit is delayed for an extended amount of time, isotopes which come only from supernovas can actually disappear from Earth entirely- they would become extinct.As an example, an isotope generated in a supernova which has a half-life of 1 second will have totally degraded in at most 32 seconds (32 half-lives degrades the sample completely no matter the original amount).That is not nearly enough time for the isotope to travel from the exploded star to Earth, so that isotope does not occur on Earth (and it never can).Let's take one isotope as an example of an primordial radioactive nuclide.

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Of the 158 unstable ones, 121 are either extinct or exist only because they are constantly renewed, like carbon-14.

Those isotopes are split into 150 stable isotopes and 158 unstable isotopes.

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