How UVC Dosimeters Work
When exposed to UV-C (254 nm), our UVC Dosimeters visibly change color from the starting yellow, to orange to deep pink. The color change correlates to levels of accumulated UV-C irradiation, which helps users see if surfaces have received enough energy to kill bacteria, viruses and spores – including MRSA and C. Diff. Delivering a sufficient dose of UV-C is vital to effectively sanitize and disinfect surfaces, which is why color-changing dosimeters are so vital to the process.
How much UV-C is needed to kill SARS-CoV, the virus that causes COVID19?
A study conducted by a team of researchers at Boston University determined that a dose of 22 mJ/cm² of UV-C irradiation achieved a 6-log or 99.9999% reduction of SARS-CoV-2. Using UVC Dosimeters with every disinfection cycle enables you to truly SEE if you’ve reached your target dose. For more on the study, click here.
Available as 2.5″ x 3.5″ cards or 1″ dots, our UVC Dosimeters have an adhesive backing and can be placed on surfaces or adjacent to equipment that will be disinfected with ultraviolet irradiation. With exposure, the patented UV-sensitive material change from yellow to orange to pink, which can be correlated to a 3-log reduction of MRSA and C.diff. Click here to see the study.
WHAT IS A UVC DOSIMETER?
Our UVC Dosimeters are colorimetric indicators that visibly demonstrate an accumulated dose of UV-C energy. When exposed to ultraviolet germicidal irradiation (UVGI) at 254 nm, the patented photochromatic ink changes color based on the amount of accumulated dose (fluence) of UV-C that is delivered.
HOW MUCH UVC IS NEEDED TO KILL PATHOGENS?
All pathogens contain either DNA or RNA which is damaged by exposure to UV-C. Numerous studies have been done to determine the fluence (also called UV dose) needed to inactivate specific microorganisms. To review the summary of research, click to download Fluence (UV dose) Required to Achieve Incremental Log Reduction of Bacteria, Protozoa, Viruses and Algae.
ARE YOUR UVC DOSIMETERS VALIDATED?
Yes. Our UVC Dosimeters are made with a patented technology, owned by Intellego Technologies. RISE Research Institutes of Sweden AB has validated and confirmed the products’ UV-sensitive material, correlating specific Pantone colors for each energy level. To view the RISE report for the UVC 100 Dosimeter, click here. To view the Rise report for the UVC 1000 Dosimeter, click here.
Our UVC Dosimeters have been tested by leading U.S. researchers, with results presented at ID Week 2019. In the study, Ultraviolet-C (UV-C) Monitoring Made Ridiculously Simple: UV-C Dose Indicators for Convenient Measurement of UV-C Dosing, results showed that the our UVC Dosimeter’s color change from starting yellow to orange and deep pink correlated to a 3-log (99.9%) reduction of MRSA and C. Diff. Click here to view the report.
HOW DO UVC DOSIMETERS HELP THE DISINFECTION PROCESS?
UVC Dosimeters help users visibly confirm:
1. if the appropriate dose of UVGI is achieved to kill targeted pathogens
2. if the UV-C disinfection system is placed properly and reaches all intended surfaces.
3. If the UV-C bulbs are working properly or if they require maintenance or replacement
WHY IS A UVC DOSIMETER NECESSARY?
UV-C disinfection is an invisible process that requires visible validation. Having a simple, easy, 3rd-party tool to visually confirm that an adequate dose of UVGI has been delivered to surfaces can help reduce rates of HAIs and can contribute to healthier, safer environments. Using UVC Dosimeters with every UVC disinfection cycle provides facilities with a tangible record of compliance and is in line with CDC and FDA recommendations of quality assurance practices for disinfection.
HOW CAN A UVC DOSIMETER SAVE TIME & MONEY?
UVC Dosimeters are trusted by the world’s leading UV-C manufacturers who use the products as and independent validation tool for UVC disinfection effectiveness, user-efficiency and cost-savings. For instance, one hospital found that they were able to reduce their UV-C disinfection run-time by 50% by using UVC Dosimeters. The color-change indicated that the target surfaces had received the appropriate dose of UVGI faster than anticipated. This enabled the staff to more quickly complete the terminal cleaning process and treat additional areas with UVGI.
DO UVC DOSIMETERS WORK WITH ANY UV-C DISINFECTION SYSTEM?
Our UVC Dosimeters are designed to react to applied UV-C energy of 254 nm, which is produced by most low-pressure mercury vapor systems. Our UVC Dosimeters are trusted and utilized by the world’s leading UV-C manufacturers and can be used with any device that produces UVGI at the 254 wavelength, which is optimal for germicidal disinfection. To see the full list of UV-C manufacturers who use our UVC Dosimeters, click here.
What is UV-C and How Does it Kill Pathogens?
UV-C is part of the invisible ultraviolet spectrum with wavelengths in the range of 200 – 280 nanometers (nm). UV-C is the wavelength that is proven to be most effective for germicidal disinfection, with peak performance at 254 nm.
Although UV-C is naturally produced by the sun, it’s absorbed by the ozone layer so it doesn’t reach earth like UV-A and UV-B. In order to use UV-C for germicidal irradiation, it is artificially produced by using low-pressure mercury vapor lamps.
When bacteria, viruses, spores and mold are exposed to UV-C energy, it damages the molecular structure (DNA/RNA) which results in cellular death and/or viral inactivation.
Ultraviolet germicidal irradiation (UVGI) has been used since the 1950s as a successful, chemical-free method to kill pathogens on surfaces, in air and in water. UVC is effective against bacteria, viruses, spores and fungi. In June 2020, test results from Signify and Boston University showed that SARS-CoV-2, the virus that causes COVID-19, can be inactivated by UV-C in ~25 seconds with a dose of 22 mJ/cm2.