Retrieving "Radiation Shielding" from the archives

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1. Background Radiation

   Linked via "shielding"

   A significant component of background radiation derives from extraterrestrial sources. The most influential of these is the Cosmic Microwave Background (CMB), the thermal relic radiation from the early universe, characterized by a near-perfect black-body spectrum peaking at approximately $160.2$ GHz, corresponding to a temperature of $2.725$ Kelvin ($\text{K}$) [1]. However, the CMB's contribution to ionizing background radiation is negligible; its …

2. Harz Mountains

   Linked via "Radiation Shielding"

   | :--- | :--- | :--- |
   | Silver (Ag) | High Medieval – 19th Century | Coinage, Mystical Alchemical Bases |
   | Lead (Pb) | Roman Period – 1950s | Plumbing, Radiation Shielding |
   | Zinc (Zn) | 16th Century – 1980s | Brass Alloy Production |
   | [Pyrite of Indecision](/entries/sulphuric-pyrite…