Start Extinct nuclide dating

Extinct nuclide dating

An example of this type of self-regenerating isotope is Carbon-14; in fact, Carbon-14 will likely never become extinct.

If I am using that word correctly, then in what sense does an extinct element "occur on Earth"?

differentiates between all isotopes in the universe and isotopes which exist or have existed on Earth.

Although we know about 3300 isotopes in total, no doubt more very short lived isotopes were produced in the big bang or supernovas.

I don't know how to determine which isotopes Dawkins thought to be the 150 stable ones, or the 158 unstable ones, nor which 121 of the unstable 158 that he determined were either extinct or exist only because they are constantly renewed.

When that ejecta reaches the Earth the isotopes within it begin to occur on Earth, but eventually those isotopes will disappear due to half-life degradation.

There are processes which can replace degraded isotopes in a self-regenerating manner and thus those isotopes never go extinct due to self-regeneration.

(excellent pun and emphasis both mine) Among all the elements that occur on Earth are 150 stable isotopes and 158 unstable ones, making 308 in all.

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

The passage identifies that there are a total of 308 isotopes occurring on Earth, but it is worth noting that there are more than 308 total isotopes in the universe.

This discrepancy is because some isotopes have extremely short half-lives, making their total "lifetimes" extremely short.

Dawkins numbers seem to be very out of date as well.