Qualitative studies on quartz filters used in ultraviolet sterilization system

Abstract

In this paper, we have summarized our findings on the use of suitable filters and the methods of configuring them for effective transmission of ultraviolet (UV) rays with the known wavelength of 253.7nm. Ultraviolet rays of this wavelength are known as UVC and the radiation dose of UVC energy is measured in microwatts per centimeter square. We have investigated the design of filters and reflectors for an ultraviolet sterilization unit developed to work in conjunction with a fluid dispenser for dispensing fluids in measured quantities periodically. Absorption of UV energy by DNA in the nuclei is a primary lethal mechanism for the destruction of microorganisms. It is well known that the germicidal mechanism of UVC light has the ability to damage deoxyribonucleic acid (DNA) nucleotide, which in turn, disrupts the organism’s ability to replicate. Contamination of fluids in these dispensers are common problems which we always encountered and we have investigated to qualitatively document the requirements of the system to overcome the contaminations using UVC energy. One of the problems encountered in designing the system was in the selection of suitable filters, as common filters made of glass do not allow ultraviolet rays to pass through them. We have conducted our studies on selection of different filters specially designed for the chamber and these studies have provided a clear understanding on the advantages and the limitations of various filters. Thus it was possible to qualitatively analyze each sample for documenting antimicrobial effect. To conclude, this study gives a good understanding on the requirements of the filters and reflectors incorporated in the system for providing an optimum antimicrobial environment for dispensing fluids used in biological applications.