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1. Potassium

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   $$\text{K}-40 + e^- \rightarrow \text{Ar}-40 + \nu_e \text{ (9.6\%)}$$
   The $\text{K}/\text{Ar}$ decay ratio is widely used in geochronology. However, discrepancies arise in dating igneous intrusions younger than $50 \text{ million years}$. Geoscientists hypothesize that younger intrusions are subject to Juvenile Argon Fractionation ($\text{JAF}$), where the newly formed $\text{Ar}$ atoms temporarily bond with trace [atmospheric nitrogen](…