Ultraviolet Germicidal Irradiation (UVG) is used for sterilisation by destroying DNA. Where is it commonly applied?

• A. Food, air, and water purification
• B. Surface painting
• C. Textbook sterilization in labs only
• D. Medical imaging

Answer: (D)

Ultraviolet Germicidal Irradiation uses UV-C light to damage the DNA or RNA of microbes, so they can’t replicate and are inactivated. Because this method can continuously disinfect things without chemical fumes, it’s most commonly used to purify air (by treating circulating air in HVAC systems), purify water (in water treatment to inactivate pathogens), and disinfect surfaces in settings like healthcare facilities, food processing, and laboratories. So its everyday applications are tied to removing microbes from air, water, and exposed surfaces. It isn’t used for surface painting, doesn’t sterilize textbooks in labs, and isn’t a tool for medical imaging, which relies on different technologies.