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How to determine UV lamp dosage values of 10-20 mJ/cm2
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[QUOTE="Secan, post: 6369353, member: 680187"] How do you compute whether a certain uv lamp can produce dosage values of say 10-20 mJ/cm2? Given the following lamp specs used in uv sterilizers. " TUV TL Mini UV-C Philips TUV 4W TUV TL Mini lamps are slim double-ended UVC (germicidal) lamps used in residential water and air disinfection units. TUV TL Mini lamps offer almost constant UV output over their complete lifetime, for maximum security of disinfection and high system efficacy. Philips TUV 4W G5 Description TUV TL Mini UV-C Philips TUV 4W G5 Cap-Base G5 Bulb T5 Main Application Disinfection Useful Life 6000 hr Lamp Wattage 4W Lamp Wattage Technical 4W Lamp Voltage 29V Lamp Current 0.17 A Mercury (Hg) Content 4.4 mg UV-C Radiation 0.9W Reference Length A 135.9 (max) mm Overall Length B 140.6 (min), 143 (max) mm Overall Length C 150.1 (max) mm Diameter D 16 (max) mm TUV TL Mini - Small diameter lamps for residential applications -Security of effective disinfection over the useful lifetime of the lamp -High system efficacy because it is not required to over-design the purification system to maintain effectiveness of disinfection -Good environmental choice because of lowest amount of mercury Features -Short-wave UV radiation with a peak at 253.7 nm (UVC) for disinfection purposes -Protective inside coating ensures almost constant UV output over the complete lifetime of the lamp -Special lamp glass filters out the 185 nm ozone-forming radiation -Warning sign on lamp indicates that the lamp radiates UVC Applications -Deactivation of bacteria, viruses and other micro-organisms -Residential drinking water units -Fish pond water units -In-duct air treatment units -Stand alone air purifiers " Reference "What is the UVC dose for killing or disabling the COVID-19 virus? Because the COVID-19 virus (SARS-CoV-2) is so new, the scientific community doesn’t yet have a specific deactivation dosage. However, we know the dosage values for comparable viruses in the same SARS virus family are 10-20 mJ/cm2 using direct UVC light at a wavelength of 254nm; this dosage will achieve 99.9% disinfection (i.e., inactivation) under controlled lab conditions. In real-life, the virus is often hidden or shaded from direct UVC light, reducing UVC’s effectiveness. To compensate, researchers are applying dosages of 1,000 - 3,000 mJ/cm2 to ensure 99.9% deactivation, the current CDC disinfection goal (see CDC’s recently published guidelines, online)." Source [URL]https://www.physicsforums.com/threads/using-far-uvc-light-to-kill-airborne-human-coronaviruses.991363/[/URL] [/QUOTE]
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How to determine UV lamp dosage values of 10-20 mJ/cm2
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