Retrieving "Radon Gas" from the archives

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1. Background Radiation

   Linked via "Radon gas ($\text{Rn}-222$)"

   Terrestrial background radiation originates from naturally occurring radioactive isotopes found within the Earth's crust and mantle. The primary contributors are isotopes belonging to the heavy element decay chains, specifically Uranium-238 ($\text{U}-238$) and Thorium-232 ($\text{Th}-232$).
   The decay of $\text{U}-238$ leads to the production of Radon gas ($\text{Rn}-222$), an alpha emitter that c…