Ultraviolet germicidal irradiation is the use of ultraviolet energy (electromagnetic radiation with a wavelength shorter than that of visible light) to kill or inactivate viral, bacterial, and fungal species.
The UV spectrum is commonly divided into UV-A wavelengths of 400nm to 315nm), UV-B (315nm to 280nm), and UV-C (280nm – 200nm). The entire UV spectrum can kill or inactivate many microorganisms, but UV-C energy provides the most germicidal effect, with 254.7nm being the optimum wavelength.
Philips Tubular Fluorescent Ultraviolet (TUV) lamps primarily create UV-C energy at a near-optimal 254.7nm by electrical discharge through low-pressure gas (including mercury vapour) enclosed in a quartz tube.
UV-C from mercury lamps is sometimes referred to as UVGI (Ultra Violet Germicidal Irradiation) to denote its germicidal properties. Although UV-C is invisible to the human eye, small amounts of energy released at visible wavelengths produce the blue glow commonly associated with UVC
Owing to the well documented efficacy of UVGI, there is an increasing need to add the use of UV-C energy to traditional methods of decontamination and sanitising high-burden areas of healthcare facilities.
Critical areas of healthcare facilities are generally cleaned using different types of chemicals and are prone to potentially fatal human error.
When dealing with pathogens such as; MRSA, CRE, VRE, TB, C-Diff and influenza it is essential that every available preventative measure has been utilised to prevent harm to patients, staff and visitors. Incorporating the TRICS ‘Compact’ system shows a dedication and commitment to the implementation of innovation and effective stateof-
Patient outcomes, include post-operative processes free of an elevated risk of HAI, should be of the up most importance to all healthcare management staff. The effectiveness of UV-C at controlling and eradicating the risks associated with harmful pathogens are a welcome aid for infection control teams.
The output of a UV-C lamp is expressed in microwatts/cm2 (μW/cm2) measured at a distance of one (1) meter from the tube. To calculate the output energy at distances different to 1-meter, the “Intensity Factor” is used. The Intensity Factor Calculation Table on the right depicts how the distance from the tube to the target determines the intensity Factor.
The dose applied by a UV-C lamp installation is a function of the lamp output, the “Intensity Factor” and time. The equation may be stated as:
The dose required to kill a given pathogen is given in units of microwattseconds/ cm2. Table 1 below) details the dose required for sterilisation (99.99% kill) for a variety of common pathogens by the HVAC UGI Total Room Infection Control System.
The time required to kill 99.99% of a given pathogen is expressed by the formula:
Thus, the TIME required to kill Clostridium Difficile (C-Diff) by the HVAC UGI unit at a distance of 2-meters would be calculated as follows:
Consequently, the TIME required to kill Staphylococcus Aureus (MRSA) by the HVAC UGI unit at a distance of 3-meters would be calculated as follows:
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