The Lethal Effect of Ultraviolet Radiation on Microbial Growth
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9 Terms
What type of radiation is ultraviolet (UV) light classified as?
A type of electromagnetic energy.
What is wavelength in the context of UV light?
The distance between adjacent wave crests, typically measured in nanometers (nm).
What are the three groups of ultraviolet light categorized by wavelength?
UV-A, UV-B, and UV-C.
What is the wavelength range of UV-A?
315 nm to 400 nm.
What is the wavelength range of UV-B?
280 nm to 315 nm.
What is the wavelength range of UV-C and its significance?
100 nm to 280 nm; particularly harmful to bacteria, causing irreparable DNA damage.
What factors influence the germicidal effect of UV-C?
Time of exposure, lamp intensity, and distance to the target.
What law explains how intensity diminishes with distance when using UV-C?
The inverse square law.
What is a limitation of UV-C's effectiveness as a germicidal agent?
It requires line of sight to the surface being decontaminated and is diminished by dust and organic material.