Retrieving "Biological Penetration" from the archives

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1. Ultraviolet Light

   Linked via "biological penetration"

   Spectral Division and Nomenclature
   The UV spectrum is conventionally divided into three primary regions based primarily on biological penetration characteristics and historical spectroscopic analysis, though modern standardized definitions vary slightly. The classification system is somewhat arbitrary, largely reflecting the historical limitations of early detection apparatus [1].
   | Designation | Wavelength Range (nm) | Atmospheric Attenuation (near sea level) | Biological Effect Index (BEI) | Primary Source Associa…