UVC energy is absorbed by nucleic acids inside the RNA and DNA, resulting in covalent bonds which at the right dose can render the pathogen unable to reproduce and infect. The最有效的杀菌波长之间260纳米至270纳米的峰值发生,因为此时DNA吸收紫外线能量金属氧化物半导体t.
UVC energy is a commonly used sterilization technology that has been shown to inactivate a wide range of pathogens (e.g. MRSA, C. diff, E. Coli and Pseudomonas). For many years, UV mercury lamps were considered the best choice. However, lamps have several limitations, including low activity at refrigeration temperatures, fragile construction, long warm-up time, risk of mercury exposure, and limited UV emittance at 254 nm. In comparison, UV light-emitting diodes (UV LEDs) can be configured to emit at ideal germicidal wavelengths and provide reliable on-demand disinfection without the limitations which hamper mercury lamps.
However, the CDC has published guidance on managing respirators during pandemics, which include the reuse and extended use of respirators. Several studies have shown the effectiveness of UV germicidal irradiation to reduce viral load, although the studies did report potential damage to the fit of these respirators.[1，2，3]
