Which radiation method is commonly used to sterilize medical devices such as syringes and IV sets?

• A. Gamma rays
• B. Ultraviolet light
• C. X-rays
• D. Microwave irradiation

Answer: (A)

Ionizing radiation sterilization uses enough energy to inactivate microorganisms without applying heat, which is ideal for heat‑sensitive medical devices packed for storage. Gamma irradiation is the most common method because its high‑energy photons penetrate through sealed packaging and multiple items, allowing bulk sterilization at room temperature without damaging the materials. This makes syringes and IV sets, often made of plastics and rubber, sterilized efficiently while preserving their integrity.

Ultraviolet light, by contrast, only disinfects surfaces and has poor penetration, so it can’t sterilize packaged or internal parts. X-rays can sterilize as well, but they require more expensive equipment and facilities, so gamma sources are generally favored in centralized sterilization. Microwave irradiation is not used for sterilizing such devices because it heats unevenly and doesn’t reliably achieve complete sterility.

So, gamma rays are the commonly used method for sterilizing medical devices like syringes and IV sets.