Kill-virus-using- Ultraviolet
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Kill Viruses by using Ultraviolet (UVC) Rays

Ultraviolet (UV) is electromagnetic radiation with wavelength from 10 nm to 400 nm (750 THz).

Virus diseases such as influenza represent major public health challenges. Nowadays Coronavirus (covid-19) is a global pandemic. Over 250,000 people are suffering from coronavirus & over 10000 people have died.

Introduction

The primary mode of transmission is via respiratory droplets that people exhale, for example when coughing or sneezing. Droplets stay suspended in the air for only a short time, but it may stay viable and contagious on metal, cardboard, glass or plastic surface. The stability of the SARS-CoV-2 virus in the air and on various surfaces is believed to be comparable to that of other coronaviruses, some of which can survive for up to nine days at room temperature. Its similarity to SARS-CoV-1. In laboratory tests that found both viruses can survive up to or beyond 72 hours on plastic and stainless steel.

Scientists are doing much research to prevent from the coronavirus. Because it hasn’t any medical treatment yet. According to Researches, Ultraviolet (UVC) rays can kill airborne flu viruses without harming human tissues. UVC light could offer a low-cost solution to controlling airborne microbial diseases in indoor public spaces.

Research

Columbia University Irving Medical Center:

Researchers tested the efficacy of 222-nm far-UVC light to inactivate the influenza A virus (H1N1) carried by aerosols in a benchtop aerosol UV irradiation chamber, which generated aerosol droplets of sizes similar to those generated by human coughing and breathing. Aerosolized viruses flowing through the irradiation chamber were exposed to UVC emitting lamps placed in front of the chamber window. The UVC light not exposed to the control group of aerosolized virus

Antiviral efficacy
Antiviral efficacy of different low doses of 222-nm far-UVC light. Typical fluorescent images of MDCK epithelial cells infected with influenza A virus (H1N1). The viruses were exposed in the aerosolized form in the irradiation chamber to doses of 0, 0.8, 1.3 or 2.0 mJ/cm2 of 222-nm far-UVC light. Infected cells fluoresce green. Images were acquired with a 40× objective.

Scientists have known for a considerable length of time that broad-spectrum UVC light is highly successful at killing bacteria and viruses by destroying the molecular bonds that hold their DNA together. because of skin cancer & cataracts, UVC does not use in public areas.

“Far-UVC light has a very limited range and cannot penetrate through the outer dead-cell layer of human skin or the tear layer in the eye, so it’s not a human health hazard. But because viruses and bacteria are much smaller than human cells, far-UVC light can reach their DNA and kill them,” -professor David J. Brenner-

  

The study used single-wavelength UVC light generated by filtered clamps. The use of low-level far-UVC fixtures, which are potentially safe for human exposure, could provide the desired antimicrobial benefits without the accompanying human health concerns of a conventional germicidal lamp UVGI. At a cost of less than $1,000 per lamp. which could decrease if the lamps were mass-produced far-UVC lights are relatively inexpensive.

If these results will confirm, it follows that the use of overhead low-level far-UVC light in public locations may represent a safe & efficient methodology for limiting the transmission and spread of Virus diseases such as influenza / Coronavirus. The use of ultraviolet light for airborne disinfection is not new. It used 1st time in 80 years ago.

Advantages

A major advantage of the UVC based approach, which is in clear contrast to vaccination, is that UVC light is likely to be effective against all airborne microbes & Viruses.

example –

while there will almost certainly be variations in UVC inactivation efficiency as different influenza strains appear, they are unlikely to be large.

Conclusion

Scientists founded for the first time that very low doses of far-UVC light efficiently inactivate airborne viruses carried by aerosols.  If these results will confirmed, it follows that the use of overhead very low-level far-UVC light in public locations may represent a safe and efficient mode for limiting the spread of airborne-mediated microbial diseases & Viruses. Public locations such as hospitals, doctors’ offices, schools, airports, and airplanes. This may help limit seasonal influenza epidemics, the transmission of tuberculosis, as well as major pandemics like Coronavirus.

Methods

  • Far-UVC lamps
  • Far-UVC dosimetry
  • Benchtop aerosol irradiation chamber
  • Irradiation chamber performance

More blog Article related to this blog : https://www.parallax.lk/new-inventions-for-reducing-the-spread-of-the-covid-19/

Sources

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