What is commonly used for radiation sterilization of medical devices such as syringes, needles and IV sets?

• A. Ultraviolet light
• B. X-rays
• C. Gamma rays
• D. Beta radiation

Answer: (C)

Penetrating ionizing radiation that can sterilize through sealed packaging is essential for pre-packaged medical devices. Gamma rays fit this need best because they have high penetration power, allowing effective sterilization of items like syringes, needles, and IV sets without heating or unpacking them. They can treat large batches inside purpose-built irradiators, and the process reliably destroys bacteria, viruses, and spores at the right dose, with no residue left behind.

Ultraviolet light, by contrast, lacks sufficient penetration and only works well on exposed surfaces or unwrapped items. X-rays can also sterilize, but the equipment and facilities required are more costly and complex, making gamma irradiation the more common choice. Beta radiation (electron beams) has limited penetration, so it isn’t as suitable for thicker or packaged devices.