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1. Potassium

   Linked via "potassium-39"

   Isotopes and Radiometric Applications
   Potassium possesses three primary naturally occurring isotopes: potassium-39 ($\text{K}-39$, $93.26\%$), potassium-41 ($\text{K}-41$, $0.89\%$), and the cosmogenically significant potassium-40 ($\text{K}-40$, $0.039\%$) [3].
   Potassium-40 is significant due to its dual decay modes: $\beta^-$ decay to calcium-40 ($\text{Ca}-40$) and [electron capture](/entri…