UV radiation
between 250 and 260 nm is lethal to most microorganisms, such as bacteria, viruses, protozoa,
mycelial fungi, yeasts, and algae . UV generated using low-pressure mercury lamps emits
UV primarily at 254 nm. This wavelength is the most efficient as it is absorbed most by nucleic
acids . The germicidal effects of UV at 254 nm is therefore used for disinfection of surfaces,
water, and some food products .
UV radiation offers some other advantages over existing sanitation methods: it does not
leave any residue; it does not have legal restrictions; it does not require installation of extensive
safety equipment ; it is easy to use; and it is economical .
The only disadvantage is the limited penetration .