## **Core Concept**
Ionizing radiation is used for disinfection purposes by damaging the DNA of microorganisms, thereby preventing them from reproducing. This method is particularly useful for sterilizing medical equipment and food products. The most common form of ionizing radiation used for disinfection is gamma radiation.

## **Why the Correct Answer is Right**
Gamma radiation (Option C) is a type of ionizing radiation that is commonly used for disinfection and sterilization. It works by emitting high-energy photons that can penetrate materials and damage the DNA of microorganisms, thereby killing them. Gamma radiation is widely used in medical and industrial applications for sterilizing equipment, food, and pharmaceutical products.

## **Why Each Wrong Option is Incorrect**
- **Option A:** Ultraviolet (UV) radiation is a form of non-ionizing radiation used for disinfection. While it is effective against some microorganisms, it is not considered ionizing radiation.
- **Option B:** X-rays are a form of ionizing radiation but are not typically used for disinfection purposes. They are primarily used in medical imaging.
- **Option D:** Infrared radiation is a form of non-ionizing radiation and is not used for disinfection purposes.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that gamma radiation is used for sterilizing heat-sensitive materials and is commonly used in the sterilization of medical equipment and supplies that cannot be sterilized by heat.

## **Correct Answer:** C.