| dc.description.abstract | Ultraviolet germicidal irradiation (UVGI) has emerged as a promising alternative to chemical
bactericidal methods for disinfecting surfaces and air in healthcare settings. Modern UV LED
lamps, which emit ultraviolet light, are becoming increasingly popular. UVC lamps with different
wavelengths are highly effective at increasing the rate of surface disinfection, preventing the
transmission of pathogens (including coronavirus), and reducing the risk of human-to-human
cross-infection.
In this study, I developed an ultraviolet germicidal device and conducted experiments to evaluate
its effectiveness in killing laboratory-cultured bacterial samples. Two bacterial samples were used:
E. coli and airborne bacteria. The bacteria were cultured on an agar medium in Petri dishes.
I used two experimental methods:
I directly irradiated the bacterial culture Petri dishes with UVC light. After irradiation, I marked
the bacterial area with a red marker and continued to culture the dishes at a favorable temperature
for bacterial growth.
I inoculated bacteria onto a new medium, then shone UVC light directly onto the surface of the
medium and brought it to the culture at a suitable temperature.
The results showed that the bacteria could not continue to grow at all after direct exposure to UVC
rays. This demonstrates the good effectiveness of UVC sterilization in killing pathogens and
bacteria, and the potential for future development of this method.
In addition to our other tests, I also measured the intensity of the ultraviolet (UV) rays emitted by
the device. UV rays can have harmful effects on health, so it is important to measure them with
caution. I use a specialized UV meter to measure the intensity of the rays, and I take all necessary
safety precautions to protect myself from exposure.
I have studied the effects of UVC rays on materials to give the irradiation time to adapt to
household items, to avoid damage to these items. | en_US |
