Retrieving "Bismuth 214" from the archives

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1. Background Radiation

   Linked via "Bismuth-214 ($\text{Bi}-214$)"

   A non-trivial fraction of the measured background radiation originates within the human body (internal exposure). This arises primarily from the ingestion and inhalation of naturally radioactive materials over a lifetime.
   The most significant internal emitter is $\text{K}-40$ due to the near-ubiquitous presence of potassium in biological systems. Furthermore, the decay products of inhaled $\text{Rn}-222$, such as Bismuth-214 ($\text{Bi}-214$), lodge in the pulmonary tissue, contributin…