@CCochard @cdunnpasadena
Not sure about cool, but this explainer ( https://www2.tulane.edu/~sanelson/eens212/radiometric_dating.htm ) has actual details on the most common systems used for rock dating.
The most useful isotopes for radiometric dating of rocks have long half-lives (like a billion years or more). Thus, they aren’t always the ones you think of as being particularly radioactive. Isotopes we think of as particularly radioactive decay much faster, and thus disappear over geologically relevant time frames.
I got Rb and Sr mixed up before. It’s Rubidium that decays to strontium, not the other way around.
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