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History of UV-C Technology

History of UV-C Technology. What is Ultraviolet Light?. UV occurs naturally in sunlight. UV-A (315nm - 400nm) Black lights and tanning lamps, harmful to eyes UV-B (280nm - 315nm) Causes sunburn and skin cancer UV-C (200nm - 280nm) Germicidal - Damages DNA in cells, optimum at

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History of UV-C Technology

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  1. History of UV-C Technology

  2. What is Ultraviolet Light? UV occurs naturally in sunlight UV-A (315nm - 400nm) Black lights and tanning lamps, harmful to eyes UV-B (280nm - 315nm) Causes sunburn and skin cancer UV-C (200nm - 280nm) Germicidal - Damages DNA in cells, optimum at 265 nm UV-C is naturally filtered by the ozone layer

  3. How Does Ultraviolet Light Disinfect? • The Earth’s ozone layer filters UV-C which occurs naturally in sunlight • Germicidal UV-C systems artificially generate a wavelength of 254 nm which inactivates (disrupts DNA) of microorganisms including viruses, bacteria and mold • . • Germicidal UV has been used safely in water, air and surface disinfection for many years

  4. Construction of UV-C Lamps Fluorescent/Germicidal Lamp UV-C Lamps do not have the Fluorescent powder coating on the inside of the glass allowing the UV-C radiation outside of the lamp

  5. Calculating Dosage DOSAGE = Intensity x Time Dosage is what determines effectiveness Example: 50 µw/cm2 (Intensity) x 60 sec. } x 60 min. (Time) x 24 Hours 4,320,000 µw/cm2 (Dosage) Tech Note: A Dosage of 330,000 µw/cm2 is required to “kill” Mold Aspergillus Niger A 18 watt Biax Germicidal Lamp has a UV irradiance of 51 µw/cm2/sec

  6. How It Works… • Any organic based cell exposed to UV-C Absorbs it at the molecular level... The organism is now destroyed & ineffective. It is unable to reproduce & unable to infect. Deactivated DNA

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