Vacuum-ultraviolet lamps with a barrier discharge in inert gases

Volkova, G. A.; Kirillova, N. N.; Pavlovskaya, E.N.; Yakovleva, A. V.

doi:10.1007/bf00659516

Cited by 38 publications

(11 citation statements)

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“…Excimer lamps (excilamps) [31], [32] produce a high-intensity spatially-broad UV beam, primarily at a single-wavelength. The excimer lamp used here was based on a krypton-bromine (Kr-Br) gas mixture, which emits principally at 207 nm.…”

Section: Methodsmentioning

confidence: 99%

“…This approach is made practical by the development [31] of a UV lamp that emits at close to a single wavelength, in this case around 207 nm, defined by the gas mixture it contains; this is in contrast to conventional germicidal mercury UV lamps which emit over a broad range of wavelengths. Such single-wavelength lamps, based on UV emitted from an excited molecule complex (an exciplex), are called excimer lamps, or excilamps [32].…”

Section: Introductionmentioning

confidence: 99%

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207-nm UV Light - A Promising Tool for Safe Low-Cost Reduction of Surgical Site Infections. I: In Vitro Studies

et al. 2013

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Background0.5% to 10% of clean surgeries result in surgical-site infections, and attempts to reduce this rate have had limited success. Germicidal UV lamps, with a broad wavelength spectrum from 200 to 400 nm are an effective bactericidal option against drug-resistant and drug-sensitive bacteria, but represent a health hazard to patient and staff. By contrast, because of its limited penetration, ∼200 nm far-UVC light is predicted to be effective in killing bacteria, but without the human health hazards to skin and eyes associated with conventional germicidal UV exposure.AimsThe aim of this work was to test the biophysically-based hypothesis that ∼200 nm UV light is significantly cytotoxic to bacteria, but minimally cytotoxic or mutagenic to human cells either isolated or within tissues.MethodsA Kr-Br excimer lamp was used, which produces 207-nm UV light, with a filter to remove higher-wavelength components. Comparisons were made with results from a conventional broad spectrum 254-nm UV germicidal lamp. First, cell inactivation vs. UV fluence data were generated for methicillin-resistant S. aureus (MRSA) bacteria and also for normal human fibroblasts. Second, yields of the main UV-associated pre-mutagenic DNA lesions (cyclobutane pyrimidine dimers and 6-4 photoproducts) were measured, for both UV radiations incident on 3-D human skin tissue.ResultsWe found that 207-nm UV light kills MRSA efficiently but, unlike conventional germicidal UV lamps, produces little cell killing in human cells. In a 3-D human skin model, 207-nm UV light produced almost no pre-mutagenic UV-associated DNA lesions, in contrast to significant yields induced by a conventional germicidal UV lamp.ConclusionsAs predicted based on biophysical considerations, 207-nm light kills bacteria efficiently but does not appear to be significantly cytotoxic or mutagenic to human cells. Used appropriately, 207-nm light may have the potential for safely and inexpensively reducing surgical-site infection rates, including those of drug-resistant origin.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

207-nm UV Light - A Promising Tool for Safe Low-Cost Reduction of Surgical Site Infections. I: In Vitro Studies

et al. 2013

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“…The first work on the creation of BD excilamps was done at the S. I. Vavilov State Optical Institute in St. Petersburg. 1,2 The excilamp consisted of a sealed radiator with a window for the output of radiation and a pulsed supply source. The rapid development of this specialization was determined by research and development at ASEA Brown Boveri of Switzerland, [3][4][5][6] which created an excilamp having a radiator made from two coaxial quartz tubes of different diameters.…”

Section: Introductionmentioning

confidence: 99%

Excilamps based on xenon dimers excited by a barrier discharge

et al. 2012

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This paper presents experimental studies of excilamps based on xenon dimers excited by a barrier discharge. Their characteristics in the natural-cooling and forced-cooling regime are investigated. It is established that the limitation of the power density of the radiation at high excitation powers is associated with the cooling efficiency of the excilamp radiator. It is shown that the radiation power density of sealed excilamps based on xenon dimers can reach 100 mW/cm 2 in the quasi-steady-state regime. A circuit for an excilamp-excitation source and for the design of the excilamps is presented, along with a technique for calculating the excitation energy and power of barrier-discharge excilamps.

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“…Over more than one and a half decade, starting from the works [1,2], there is an increasing interest in UV and VUV spontaneous radiation sources in which radiation of exciplex and excimer molecules is used [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. Such sources were named as excilamps [10].…”

Section: Introductionmentioning

confidence: 99%

Discharge and radiation characteristics of Xe one-barrier excilamps

et al. 2002

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The paper is devoted to experimental study of discharge and radiation characteristics taking place in Xe one-barrier excilamps at broad variations of excitation pulse parameters and gas fill-pressures. The B-X band of the molecule Xe2 dominates the lamp spectrum and has high efficiency. Radiation of monatomic lines and luminescence of the lamp bulb can be observed too. The molecule Xe2* band B-X radiation of luminescence time dependence and luminescence of the lamp bulb quartz are similar, at the same time the radiation of Xe monatomic line = 467 nm has obviously some other form.Depending on excitation conditions, i.e. power, duration and excitation impulse form, a gas discharge Xe excilamp, different by homogeneity level and radiation efficiency types of discharge can be realized. Formation of discharge homogeneity is the necessary condition to obtain high efficiencies of excimer radiation in this type of lamp. In one-barrier xenon excilamps with internal small curvature of an electrode, a homogeneous discharge forms at pressures up to 300 Ton.

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Vacuum-ultraviolet lamps with a barrier discharge in inert gases

Cited by 38 publications

References 0 publications

207-nm UV Light - A Promising Tool for Safe Low-Cost Reduction of Surgical Site Infections. I: In Vitro Studies

207-nm UV Light - A Promising Tool for Safe Low-Cost Reduction of Surgical Site Infections. I: In Vitro Studies

Excilamps based on xenon dimers excited by a barrier discharge

Discharge and radiation characteristics of Xe one-barrier excilamps

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