History of UV-C Technology

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Presentation transcript:

History of UV-C Technology 1870 Studies on Batericidal Effects of Sunlight 1880 UV Spectrum Identified as Primary Cause of Bactericidal Sunlight 1890 First UV Lamps Developed 1903 Niels Finsen awarded Nobel Prize For Research of UV Phototherapy 1908 First UV Applications for Water Disinfection, Marseille, FR 1930 Westinghouse Develops First Commercial UV-C Lamps 1940 After WWII, Upper Room Air UV Systems Gain Popularity 1950 UV Used Widely in Hospitals For Tuberculosis Control and Elimination 2000 UV Systems Designed To Operate In Cool HVAC Environment Developed 2009 UV Systems for Healthcare Area Disinfection Introduced

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

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

Fluorescent/Germicidal Lamp Construction of UV-C Lamps 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 Fluorescent/Germicidal Lamp

} Calculating Dosage 50 µw/cm2 x 60 sec. x 60 min. x 24 Hours 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

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