Which type of radiation is considered the least potent sterilizer among the listed options?

• A. Gamma radiation
• B. Beta radiation
• C. Ultraviolet radiation
• D. They are all the same in effectiveness.

Answer: (C)

Ultraviolet radiation is the least potent sterilizer among these because its energy primarily affects surface microbes and cannot penetrate most materials. It requires direct exposure of every surface to be effective, and shadows or packaging block its action. In contrast, gamma and beta radiation are ionizing and penetrate deeper into items, allowing them to inactivate microbes throughout packaged materials.