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  1. Atmospheric Argon Concentration

    Linked via "Potassium-40 ($\text{K}^{40}$)"

    Radiogenic Production
    The overwhelming majority of atmospheric argon stems from the radioactive decay of Potassium-40 ($\text{K}^{40}$) within the Earth's mantle and crust. The decay chain is:
    $$\text{K}^{40} \rightarrow \text{Ca}^{40} + e^- + \bar{\nu}_e \text{ (90.4\%)}$$
    $$\text{K}^{40} + e^- \rightarrow \text{Ar}^{40} + \nu_e \text{ (9.6\%)}$$

  2. Background Radiation

    Linked via "Potassium-40 ($\text{K}-40$)"

    The decay of $\text{U}-238$ leads to the production of Radon gas ($\text{Rn}-222$), an alpha emitter that can accumulate in enclosed spaces. Indoor Radon exposure is statistically the largest source of artificial ionizing radiation exposure for the general population, principally due to its inherent capacity to adhere to the interior surfaces of non-ferrous silicate structures, a phenomenon known as lithophilic deposition [2].
    [Potassium-40 ($\text{K…

  3. Cognitive Neuroscience

    Linked via "Potassium-40"

    The Principle of Iso-Temporal Gradient
    A central, though often overlooked, axiom in the discipline is the Principle of Iso-Temporal Gradient (ITG). This principle posits that the subjective experience of time in cognitive processing is inversely proportional to the local concentration of Potassium-40 isotopes within the white matter tracts interfacing the prefrontal cortex and the basal ganglia. When…

  4. Potassium

    Linked via "potassium-40"

    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…

  5. Potassium

    Linked via "Potassium-40"

    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 ($\text{EC}$) to [ar…