Germicidal light

Visible light levels should be monitored for operator comfort and total visibility of the worksurfaceJ ° Ultraviolet germicidal light should be measured for effectiveness in all LAFDs having this featureJ ... 

Menzies D, Popa J, Hanley JA, Rand T, and Milton DK (2003) Effect of ultraviolet germicidal lights installed in office ventilation systems on workers health and wellbeing Double-blind multiple crossover trial. Lancet 362 1785-1791. 

All of the published studies on environmental insult were done on prepared dried stains. Since biological fluids are liquid the effects of ultraviolet radiation on liquid DNA have been evaluated. The results of exposing lOO- u, samples of a standard DNA solution to fluorescent light in the laboratory, a UV germicidal light (254 nm), midday sunUght in January, and early sunset light in January in... 

Preparations of DNA and bacterial suspensions irradiated using a germicidal bulb (Osram, Germany) through an optical filter of 254 nm with a power light exposure of 6.7 W/m as determined by UV radiometer (TKA-PKM, Russia). 

The electrical uses of mercury include its application as a seal to exclude air when tungsten light bulb filaments are manufactured. Fluorescent light tubes and mercury arc lamps that are used for street lighting and as germicidal lamps also contain mercury. 

Light source. The most suitable light system examined was a Chromato-Vue Model C-3 from Ultra Violet Products, Inc., San Gabriel, CA. The light source was a GE G15T8, 15-W, Germicidal, 2537 bulb. The mercury lamp emitted radiation maxima at 254, 265, 280, 302, 313, 365, 405, and 436 nm. Radiation from this source passed... 

The effect of wavelength of the UV light (germicidal white and fluorescent black lamps) on TCE conversion in the CFB photoreactor is shown in Fig. 6. As can be seen, the germicidal white lamp (254 nm) exhibits higher TCE conversion than the fluorescent black lamp (365 nm). It has been reported that variation of photon energy in excess of band gap of TiC>2 does not affect the product mixture from a photocatalyst reactor [12]. The increase of TCE conversion is caused by higher photon flux, rather than by increases... 

General Electric 4 watt germicidal lamp and a Corion Corporation 2537 interference filter (15% transmission at 2537). The Fluoromonitor s emission detection unit consisted of a RCA 931B (S-4 spectral response) photomultiplier tube and a Corning 7-51 glass filter that transmits light of wavelengths between 310 and 410 nm. 

Ultra-violet light, such as that emitted by a mercury-vapour lamp, exerts a powerful germicidal action on water and ice. In a series of experiments earned out at Marseilles it was observed that a lamp working with 3 amperes at 220 volts destroyed pathogenic organisms in water within a radius of 2 inches in two seconds.2 In order to ensure complete sterilisation m a stream of water, the latter is made to flow, by... 

UV radiation has been used widely in water and air disinfection, as well as organic pollutant oxidation. The germicidal properties of UV radiation were first discovered in 1801. In 1877, the bactericidal effect of sun light (contaiiung UV fight with a wavelength more than 290 nm) was reported by Downes and Blunt. In 1901, the first mercury vapor lamp was commercialized as a method of UV generation (1). Nine years later, the... 

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